The first time I made Cauliflower Gratin, I was skeptical. Cauliflower, while healthy, had always seemed a bit… bland. But I was looking for a comforting side dish to accompany a roast dinner and stumbled upon a recipe promising creamy, cheesy goodness. Intrigued, I gave it a try, and oh my goodness, was I wrong about cauliflower! The transformation was nothing short of magical. The cauliflower florets, tender yet with a slight bite, were enveloped in a luxuriously creamy, cheesy sauce, baked to golden-brown perfection. The aroma alone was enough to make our mouths water. My family, even the veggie-hesitant ones, devoured it. It wasn’t just a side dish; it was the star of the meal. This Cauliflower Gratin is now a staple in our house, requested for holiday dinners, potlucks, and any time we crave a comforting and satisfying vegetarian dish. It’s surprisingly easy to make, yet feels incredibly decadent and impressive. Prepare to fall in love with cauliflower all over again – this gratin is pure comfort food bliss!
Ingredients
To create a truly exceptional Cauliflower Gratin, you’ll need a selection of fresh, high-quality ingredients. The quality of the cheese and cream will significantly impact the richness and flavor of the dish, so choose wisely. Here’s a detailed list of what you’ll need, broken down for clarity and ease of shopping:
For the Cauliflower Gratin:
- 1 large head of Cauliflower (about 2-2.5 pounds), cut into florets: The star of the dish! Choose a firm, white head of cauliflower without any brown spots. Fresh cauliflower is essential for the best flavor and texture. Cut the cauliflower into florets that are roughly uniform in size for even cooking.
- 4 tablespoons Unsalted Butter: Butter provides richness and flavor to both the cauliflower and the creamy sauce. Unsalted butter is preferred to control the salt level in the dish. It’s used for sautéing the onion and creating the roux for the béchamel sauce.
- 1 medium Yellow Onion, finely diced: Onion forms the aromatic base of the sauce, adding sweetness and depth of flavor. Yellow onions are versatile and hold up well during cooking. Finely dicing the onion ensures it cooks evenly and blends seamlessly into the sauce.
- 1/4 cup All-Purpose Flour: Flour is used to create a roux, which is the thickening agent for the béchamel sauce. All-purpose flour works perfectly well. Make sure to cook the roux properly to avoid a floury taste.
- 3 cups Whole Milk: Whole milk provides the creamy base for the béchamel sauce. Whole milk is recommended for its richness and creamy texture. You can use 2% milk for a slightly lighter sauce, but whole milk will result in a more decadent gratin.
- 1 cup Heavy Cream: Heavy cream further enhances the richness and creaminess of the sauce, adding a luxurious texture. Heavy cream is essential for a truly decadent Cauliflower Gratin. You can use half-and-half for a slightly lighter version, but heavy cream provides the best results.
- 2 cups Gruyère Cheese, grated: Gruyère cheese is a classic choice for Cauliflower Gratin, known for its nutty, slightly sweet, and complex flavor that melts beautifully. Gruyère provides a wonderful depth of flavor and a smooth, creamy texture when melted. Freshly grated Gruyère is recommended for the best flavor and melting quality.
- 1 cup Sharp Cheddar Cheese, grated: Sharp cheddar cheese adds a tangy, bold, and savory flavor that complements the Gruyère and provides a nice contrast. Sharp cheddar adds a sharpness that balances the richness of the Gruyère and cream. Freshly grated sharp cheddar is preferred.
- 1/2 cup Parmesan Cheese, grated: Parmesan cheese adds a salty, savory, and umami-rich flavor that enhances the overall cheese profile and creates a golden-brown crust when baked. Parmesan cheese also contributes to the gratin’s signature cheesy top. Freshly grated Parmesan is recommended for the best flavor and texture.
- 1/4 teaspoon Nutmeg, freshly grated (or ground): Nutmeg adds a warm, slightly sweet, and aromatic spice note that complements the creamy sauce and cheeses beautifully. Freshly grated nutmeg is preferred for its more intense and nuanced flavor, but ground nutmeg works well as a convenient alternative. Nutmeg is a classic spice in béchamel sauce and gratins.
- 1/2 teaspoon Dijon Mustard: Dijon mustard adds a subtle tang and complexity to the sauce, balancing the richness and cheese flavors. Dijon mustard provides a gentle acidity and a slight sharpness that complements the creamy sauce without being overpowering.
- Salt, to taste: Essential for seasoning the gratin and enhancing all the flavors. Start with about 1 teaspoon of kosher salt and adjust to your preference after tasting.
- Black Pepper, freshly ground, to taste: Provides a classic peppery bite and complements the richness of the dish. Freshly ground black pepper offers a much more aromatic and intense flavor than pre-ground pepper.
- Optional: 1/4 cup Breadcrumbs (Panko or regular), for topping: Breadcrumbs add a crispy topping and textural contrast to the creamy gratin. Panko breadcrumbs provide a lighter and crispier texture, while regular breadcrumbs offer a more traditional topping. This is optional, but adds a nice textural element.
- Optional: Fresh Thyme sprigs, for garnish: Fresh thyme sprigs add a fragrant, herbaceous garnish and a touch of visual appeal. Fresh thyme complements the flavors of the gratin and adds a fresh, aromatic element.
Instructions
Let’s embark on creating this classic and comforting Cauliflower Gratin. Follow these step-by-step instructions for a perfectly creamy, cheesy, and golden-brown result:
Step 1: Prepare the Cauliflower – Blanching for Tenderness
Blanching the cauliflower florets before baking ensures they are tender-crisp and cook evenly in the gratin.
- Bring Water to Boil: Bring a large pot of salted water to a rolling boil. Add about 1 tablespoon of salt per gallon of water. Salting the water seasons the cauliflower from the inside out.
- Blanch Cauliflower Florets: Add the cauliflower florets to the boiling water. Blanch for 3-5 minutes, or until they are slightly tender-crisp. The cauliflower should be slightly softened but still have a bit of bite. Avoid over-blanching, as they will continue to cook in the oven.
- Drain and Rinse with Cold Water: Drain the cauliflower florets in a colander and immediately rinse them with cold water to stop the cooking process. Rinsing with cold water prevents overcooking and helps to retain their vibrant color.
- Set Aside to Drain: Set the blanched cauliflower aside to drain completely while you prepare the béchamel sauce. Excess moisture can make the gratin watery, so ensure the cauliflower is well-drained.
Step 2: Make the Béchamel Sauce – Creamy Base
The béchamel sauce is the foundation of our creamy Cauliflower Gratin. Making a smooth and lump-free béchamel is key to a perfect gratin.
- Melt Butter: In a large saucepan or Dutch oven over medium heat, melt the butter.
- Sauté Onion: Add the finely diced onion to the melted butter and sauté for 5-7 minutes, or until softened and translucent. Sautéing the onion softens it and releases its flavor, creating a flavorful base for the sauce.
- Add Flour and Make Roux: Add the all-purpose flour to the saucepan with the sautéed onions. Cook, stirring constantly with a whisk or wooden spoon, for 1-2 minutes, until the roux (butter and flour mixture) is smooth and pale golden. Cooking the roux removes the raw flour taste and allows it to thicken the sauce properly. Be careful not to brown the roux too much, as we want a light-colored béchamel.
- Gradually Whisk in Milk: Gradually whisk in the whole milk, about 1/2 cup at a time, ensuring each addition is fully incorporated and smooth before adding more. Whisk constantly to prevent lumps from forming. Adding the milk gradually and whisking continuously is crucial for a smooth béchamel sauce.
- Simmer and Thicken: Continue to whisk and cook the sauce over medium heat until it thickens enough to coat the back of a spoon, about 5-7 minutes. The sauce should be smooth, creamy, and slightly thickened.
- Stir in Heavy Cream, Spices, and Mustard: Reduce the heat to low and stir in the heavy cream, freshly grated nutmeg, Dijon mustard, salt, and freshly ground black pepper. Stir until well combined and heated through. Adding heavy cream at the end preserves its richness and prevents it from curdling.
- Remove from Heat: Remove the béchamel sauce from the heat.
Step 3: Assemble the Gratin – Layering Flavors
Now we’ll assemble the gratin, layering the blanched cauliflower and the creamy béchamel sauce with cheese.
- Preheat Oven (if not already): Ensure your oven is preheated to 400°F (200°C).
- Grease Baking Dish: Lightly grease a 9×13 inch baking dish or a similar-sized oven-safe dish with butter or cooking spray. Greasing prevents the gratin from sticking to the dish.
- Layer Cauliflower in Baking Dish: Arrange the blanched and drained cauliflower florets evenly in the prepared baking dish in a single layer.
- Pour Béchamel Sauce Over Cauliflower: Pour the creamy béchamel sauce evenly over the cauliflower florets, ensuring they are well coated with the sauce.
- Sprinkle with Cheeses: Sprinkle the grated Gruyère cheese, grated sharp cheddar cheese, and grated Parmesan cheese evenly over the béchamel sauce. Ensure the entire surface is covered with cheese for a beautiful cheesy topping.
- Optional: Top with Breadcrumbs: If using breadcrumbs, sprinkle them evenly over the cheese layer.
Step 4: Bake the Cauliflower Gratin – Golden Brown Perfection
Baking the gratin until golden brown and bubbly is the final step to achieve that classic gratin texture and flavor.
- Bake in Preheated Oven: Bake in the preheated oven for 20-25 minutes, or until the gratin is golden brown and bubbly, and the cheese is melted and nicely browned. The gratin is done when the cheese is melted and bubbly, and the top is golden brown.
- Broil for Extra Browning (Optional): For an extra golden-brown and crispy top, you can broil the gratin for the last 1-2 minutes of baking. Watch carefully to prevent burning. Broiling adds a final touch of browning and crispiness to the cheese topping.
Step 5: Rest and Serve – Enjoy the Creamy Goodness
Resting the gratin briefly before serving allows it to set slightly and makes it easier to serve.
- Let Rest Briefly: Remove the Cauliflower Gratin from the oven and let it rest for 5-10 minutes before serving. Resting allows the gratin to set slightly, making it easier to slice and serve, and prevents it from being too runny.
- Garnish (Optional): Garnish with fresh thyme sprigs, if desired, for a touch of freshness and visual appeal.
- Serve Hot: Serve Cauliflower Gratin hot as a side dish. It’s best enjoyed warm, when the sauce is creamy and the cheese is melted and gooey.
Nutrition Facts
Cauliflower Gratin is a comforting and delicious side dish that can also provide some nutritional value, primarily from the cauliflower and dairy. Keep in mind that nutritional values can vary based on specific ingredients, cheese types, portion sizes, and cooking methods.
Servings:
This recipe typically yields approximately 8-10 servings, depending on portion sizes. It’s perfect for a family dinner or a small gathering.
Calories per Serving (Estimated):
Per serving (estimated, based on 10 servings):
- Calories: Approximately 350-450 calories
- Protein: Around 15-20 grams
- Fat: Around 25-35 grams (primarily from butter, cream, and cheese)
- Carbohydrates: Approximately 10-15 grams (primarily from cauliflower, flour, and milk)
- Fiber: Approximately 3-4 grams
Important Note: These are estimates. For precise nutritional information, you can use online nutrition calculators and input the specific ingredients and quantities you use. Cauliflower Gratin is a rich and calorie-dense dish due to the cream, butter, and cheese. However, it also provides calcium, protein, and some vitamins and minerals from the cauliflower and dairy. Enjoy in moderation as part of a balanced diet.
Preparation Time
While Cauliflower Gratin is a relatively straightforward dish to make, it does require some time for preparation, especially for making the béchamel sauce and baking. Here’s a breakdown:
Prep Time:
- Active Prep: Approximately 30-40 minutes (includes cutting cauliflower, chopping onion, grating cheese, making béchamel sauce, and assembling gratin).
Cook Time:
- Blanching Cauliflower: 5-7 minutes
- Making Béchamel Sauce: 10-15 minutes
- Baking Gratin: 20-25 minutes
- Resting Time: 5-10 minutes
Total Time:
- Total Time: Approximately 1 hour 10 minutes to 1 hour 30 minutes.
Time-Saving Tip: You can blanch the cauliflower florets ahead of time, even a day in advance, and store them in an airtight container in the refrigerator. This will reduce the active prep time on the day you plan to make the gratin. You can also grate the cheeses in advance.
How to Serve
Cauliflower Gratin is a versatile side dish that complements a wide variety of main courses. Here are some serving suggestions to create a complete and delicious meal:
Classic Main Course Pairings:
- Roasted Chicken or Turkey: Cauliflower Gratin is a classic side dish for roasted chicken or turkey, especially for holiday meals or Sunday dinners.
- Roast Beef or Prime Rib: The rich and creamy gratin pairs beautifully with the savory flavors of roast beef or prime rib.
- Pork Tenderloin or Roast Pork: Cauliflower Gratin complements the sweetness and tenderness of pork tenderloin or roast pork.
- Baked Ham: The cheesy and creamy gratin is a delicious accompaniment to baked ham, especially for Easter or holiday gatherings.
- Steak: A hearty steak and creamy Cauliflower Gratin make for a satisfying and indulgent meal.
Vegetarian Main Course Pairings:
- Lentil Loaf or Vegetarian Wellington: Cauliflower Gratin pairs well with vegetarian main courses like lentil loaf or vegetarian Wellington, adding richness and comfort.
- Mushroom Risotto or Pasta: Serve alongside mushroom risotto or a creamy pasta dish for a vegetarian feast.
- Vegetable Tart or Quiche: Cauliflower Gratin complements vegetable tarts or quiches, adding a warm and cheesy element.
Serving Styles:
- Side Dish: The most common way to serve Cauliflower Gratin is as a side dish alongside a main course.
- Individual Gratins: For a more elegant presentation, you can bake the gratin in individual ramekins or small gratin dishes.
- Buffet Style: Cauliflower Gratin is a great dish for buffet-style gatherings or potlucks, as it can be made ahead of time and reheated.
Garnish Ideas:
- Fresh Thyme Sprigs: As mentioned earlier, fresh thyme sprigs add a fragrant and visually appealing garnish.
- Chopped Parsley or Chives: Adds a fresh, herbaceous note and vibrant green color. Chopped fresh herbs provide a pop of color and freshness.
- Extra Grated Parmesan Cheese: Sprinkle a little extra grated Parmesan cheese over the top just before serving for added visual appeal and cheesy flavor.
- Cracked Black Pepper: A sprinkle of freshly cracked black pepper adds a final touch of flavor and visual contrast.
Additional Tips for Perfect Cauliflower Gratin
To ensure your Cauliflower Gratin is a resounding success and truly delicious, consider these additional tips and tricks:
Tip 1: Don’t Overcook the Cauliflower – Maintain Texture
While blanching the cauliflower is important for tenderness, be careful not to overcook it during the blanching process. Overcooked cauliflower will become mushy and lose its texture in the gratin. Blanch the florets just until they are slightly tender-crisp, about 3-5 minutes. They will continue to cook in the oven. Maintaining some texture in the cauliflower is key to a satisfying gratin.
Tip 2: Make a Smooth Béchamel Sauce – Avoid Lumps
A smooth and lump-free béchamel sauce is essential for a creamy and luxurious Cauliflower Gratin. To prevent lumps, add the milk gradually to the roux, whisking constantly and vigorously after each addition. Ensure each addition of milk is fully incorporated and smooth before adding more. If lumps do form, you can strain the sauce through a fine-mesh sieve to remove them. Low heat and constant whisking are your best friends when making béchamel.
Tip 3: Use a Blend of Cheeses – Layer Flavors
Using a blend of cheeses, such as Gruyère, sharp cheddar, and Parmesan, creates a more complex and flavorful Cauliflower Gratin than using just one type of cheese. Gruyère provides nuttiness and meltability, cheddar adds sharpness, and Parmesan contributes saltiness and a golden-brown crust. Experiment with different cheese combinations to find your favorite flavor profile. Other good cheese options include Fontina, Monterey Jack, or Gouda.
Tip 4: Season Generously – Enhance Flavor
Seasoning is crucial for bringing out the best flavors in Cauliflower Gratin. Don’t be shy with salt, black pepper, and nutmeg in the béchamel sauce. Taste the sauce before assembling the gratin and adjust seasoning as needed. Salt enhances the flavors of the cauliflower, cheese, and cream, while pepper and nutmeg add warmth and complexity. Proper seasoning elevates the entire dish.
Tip 5: Bake Until Golden Brown and Bubbly – Achieve Perfect Texture
Bake the Cauliflower Gratin until it is golden brown and bubbly, and the cheese is melted and nicely browned. This indicates that the gratin is heated through, the cheese is melted and gooey, and the top is beautifully caramelized. Baking to a golden-brown color not only enhances the visual appeal but also develops deeper flavors and a slightly crispy top. Broiling for the last minute or two can further enhance browning and crispiness, but watch carefully to prevent burning.
Frequently Asked Questions (FAQ) About Cauliflower Gratin
Got questions about making Cauliflower Gratin? You’re not alone! Here are answers to some frequently asked questions to help you master this classic dish:
Q1: Can I make Cauliflower Gratin ahead of time?
A: Yes, you can prepare Cauliflower Gratin ahead of time, which makes it a great dish for entertaining or busy weeknights. You can assemble the gratin completely, up to the point of baking, and store it covered in the refrigerator for up to 24 hours. When ready to bake, let it sit at room temperature for about 30 minutes before baking as directed. You may need to add a few extra minutes to the baking time if baking directly from the refrigerator. Alternatively, you can bake the gratin completely ahead of time, let it cool, and then reheat it gently in a preheated oven at 350°F (175°C) until heated through.
Q2: Can I use frozen cauliflower for Cauliflower Gratin?
A: While fresh cauliflower is preferred for the best texture and flavor, you can use frozen cauliflower in a pinch. However, frozen cauliflower tends to be more watery than fresh cauliflower. If using frozen cauliflower, thaw it completely and squeeze out as much excess moisture as possible before blanching or adding it to the gratin. You may also need to adjust the cooking time slightly, as frozen cauliflower may cook faster. Fresh cauliflower will generally result in a better texture and less watery gratin.
Q3: Can I make Cauliflower Gratin dairy-free or vegan?
A: Yes, you can adapt Cauliflower Gratin to be dairy-free or vegan, although it will significantly change the flavor and texture. For a dairy-free version, you can substitute plant-based milk (such as oat milk or cashew milk) for the whole milk and heavy cream in the béchamel sauce, and use vegan butter or olive oil for the roux. For cheese, you can use vegan shredded cheeses, although they may not melt and brown as well as dairy cheese. Nutritional yeast can be added to the sauce for a cheesy flavor. For a vegan Cauliflower Gratin, ensure all ingredients are plant-based.
Q4: What other vegetables can I add to Cauliflower Gratin?
A: While classic Cauliflower Gratin focuses on cauliflower as the star vegetable, you can add other vegetables for variations. Broccoli florets, leeks (sautéed), mushrooms (sautéed), or roasted butternut squash cubes can be added to the gratin along with the cauliflower. When adding other vegetables, adjust the quantity of cauliflower accordingly to maintain the balance of the dish. Roasting root vegetables before adding them to the gratin can enhance their flavor and texture.
Q5: How do I reheat leftover Cauliflower Gratin?
A: Leftover Cauliflower Gratin can be reheated successfully. The best way to reheat it is in a preheated oven at 350°F (175°C) until heated through and bubbly, about 15-20 minutes. Cover the gratin loosely with aluminum foil to prevent the top from browning too much. You can also reheat individual portions in the microwave, but the texture may be slightly softer. Reheating in the oven will help to maintain the creamy texture and crispy top of the gratin.
With these detailed instructions, tips, and answers to frequently asked questions, you are now fully equipped to create a truly perfect and comforting Cauliflower Gratin that will impress your family and friends. Enjoy the cheesy, creamy goodness!
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Cauliflower Gratin recipe
Ingredients
For the Cauliflower Gratin:
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- 1 large head of Cauliflower (about 2–2.5 pounds), cut into florets: The star of the dish! Choose a firm, white head of cauliflower without any brown spots. Fresh cauliflower is essential for the best flavor and texture. Cut the cauliflower into florets that are roughly uniform in size for even cooking.
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- 4 tablespoons Unsalted Butter: Butter provides richness and flavor to both the cauliflower and the creamy sauce. Unsalted butter is preferred to control the salt level in the dish. It’s used for sautéing the onion and creating the roux for the béchamel sauce.
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- 1 medium Yellow Onion, finely diced: Onion forms the aromatic base of the sauce, adding sweetness and depth of flavor. Yellow onions are versatile and hold up well during cooking. Finely dicing the onion ensures it cooks evenly and blends seamlessly into the sauce.
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- 1/4 cup All-Purpose Flour: Flour is used to create a roux, which is the thickening agent for the béchamel sauce. All-purpose flour works perfectly well. Make sure to cook the roux properly to avoid a floury taste.
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- 3 cups Whole Milk: Whole milk provides the creamy base for the béchamel sauce. Whole milk is recommended for its richness and creamy texture. You can use 2% milk for a slightly lighter sauce, but whole milk will result in a more decadent gratin.
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- 1 cup Heavy Cream: Heavy cream further enhances the richness and creaminess of the sauce, adding a luxurious texture. Heavy cream is essential for a truly decadent Cauliflower Gratin. You can use half-and-half for a slightly lighter version, but heavy cream provides the best results.
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- 2 cups Gruyère Cheese, grated: Gruyère cheese is a classic choice for Cauliflower Gratin, known for its nutty, slightly sweet, and complex flavor that melts beautifully. Gruyère provides a wonderful depth of flavor and a smooth, creamy texture when melted. Freshly grated Gruyère is recommended for the best flavor and melting quality.
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- 1 cup Sharp Cheddar Cheese, grated: Sharp cheddar cheese adds a tangy, bold, and savory flavor that complements the Gruyère and provides a nice contrast. Sharp cheddar adds a sharpness that balances the richness of the Gruyère and cream. Freshly grated sharp cheddar is preferred.
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- 1/2 cup Parmesan Cheese, grated: Parmesan cheese adds a salty, savory, and umami-rich flavor that enhances the overall cheese profile and creates a golden-brown crust when baked. Parmesan cheese also contributes to the gratin’s signature cheesy top. Freshly grated Parmesan is recommended for the best flavor and texture.
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- 1/4 teaspoon Nutmeg, freshly grated (or ground): Nutmeg adds a warm, slightly sweet, and aromatic spice note that complements the creamy sauce and cheeses beautifully. Freshly grated nutmeg is preferred for its more intense and nuanced flavor, but ground nutmeg works well as a convenient alternative. Nutmeg is a classic spice in béchamel sauce and gratins.
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- 1/2 teaspoon Dijon Mustard: Dijon mustard adds a subtle tang and complexity to the sauce, balancing the richness and cheese flavors. Dijon mustard provides a gentle acidity and a slight sharpness that complements the creamy sauce without being overpowering.
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- Salt, to taste: Essential for seasoning the gratin and enhancing all the flavors. Start with about 1 teaspoon of kosher salt and adjust to your preference after tasting.
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- Black Pepper, freshly ground, to taste: Provides a classic peppery bite and complements the richness of the dish. Freshly ground black pepper offers a much more aromatic and intense flavor than pre-ground pepper.
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- Optional: 1/4 cup Breadcrumbs (Panko or regular), for topping: Breadcrumbs add a crispy topping and textural contrast to the creamy gratin. Panko breadcrumbs provide a lighter and crispier texture, while regular breadcrumbs offer a more traditional topping. This is optional, but adds a nice textural element.
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- Optional: Fresh Thyme sprigs, for garnish: Fresh thyme sprigs add a fragrant, herbaceous garnish and a touch of visual appeal. Fresh thyme complements the flavors of the gratin and adds a fresh, aromatic element.
Instructions
Step 1: Prepare the Cauliflower – Blanching for Tenderness
Blanching the cauliflower florets before baking ensures they are tender-crisp and cook evenly in the gratin.
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- Bring Water to Boil: Bring a large pot of salted water to a rolling boil. Add about 1 tablespoon of salt per gallon of water. Salting the water seasons the cauliflower from the inside out.
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- Blanch Cauliflower Florets: Add the cauliflower florets to the boiling water. Blanch for 3-5 minutes, or until they are slightly tender-crisp. The cauliflower should be slightly softened but still have a bit of bite. Avoid over-blanching, as they will continue to cook in the oven.
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- Drain and Rinse with Cold Water: Drain the cauliflower florets in a colander and immediately rinse them with cold water to stop the cooking process. Rinsing with cold water prevents overcooking and helps to retain their vibrant color.
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- Set Aside to Drain: Set the blanched cauliflower aside to drain completely while you prepare the béchamel sauce. Excess moisture can make the gratin watery, so ensure the cauliflower is well-drained.
Step 2: Make the Béchamel Sauce – Creamy Base
The béchamel sauce is the foundation of our creamy Cauliflower Gratin. Making a smooth and lump-free béchamel is key to a perfect gratin.
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- Melt Butter: In a large saucepan or Dutch oven over medium heat, melt the butter.
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- Sauté Onion: Add the finely diced onion to the melted butter and sauté for 5-7 minutes, or until softened and translucent. Sautéing the onion softens it and releases its flavor, creating a flavorful base for the sauce.
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- Add Flour and Make Roux: Add the all-purpose flour to the saucepan with the sautéed onions. Cook, stirring constantly with a whisk or wooden spoon, for 1-2 minutes, until the roux (butter and flour mixture) is smooth and pale golden. Cooking the roux removes the raw flour taste and allows it to thicken the sauce properly. Be careful not to brown the roux too much, as we want a light-colored béchamel.
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- Gradually Whisk in Milk: Gradually whisk in the whole milk, about 1/2 cup at a time, ensuring each addition is fully incorporated and smooth before adding more. Whisk constantly to prevent lumps from forming. Adding the milk gradually and whisking continuously is crucial for a smooth béchamel sauce.
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- Simmer and Thicken: Continue to whisk and cook the sauce over medium heat until it thickens enough to coat the back of a spoon, about 5-7 minutes. The sauce should be smooth, creamy, and slightly thickened.
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- Stir in Heavy Cream, Spices, and Mustard: Reduce the heat to low and stir in the heavy cream, freshly grated nutmeg, Dijon mustard, salt, and freshly ground black pepper. Stir until well combined and heated through. Adding heavy cream at the end preserves its richness and prevents it from curdling.
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- Remove from Heat: Remove the béchamel sauce from the heat.
Step 3: Assemble the Gratin – Layering Flavors
Now we’ll assemble the gratin, layering the blanched cauliflower and the creamy béchamel sauce with cheese.
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- Preheat Oven (if not already): Ensure your oven is preheated to 400°F (200°C).
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- Grease Baking Dish: Lightly grease a 9×13 inch baking dish or a similar-sized oven-safe dish with butter or cooking spray. Greasing prevents the gratin from sticking to the dish.
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- Layer Cauliflower in Baking Dish: Arrange the blanched and drained cauliflower florets evenly in the prepared baking dish in a single layer.
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- Pour Béchamel Sauce Over Cauliflower: Pour the creamy béchamel sauce evenly over the cauliflower florets, ensuring they are well coated with the sauce.
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- Sprinkle with Cheeses: Sprinkle the grated Gruyère cheese, grated sharp cheddar cheese, and grated Parmesan cheese evenly over the béchamel sauce. Ensure the entire surface is covered with cheese for a beautiful cheesy topping.
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- Optional: Top with Breadcrumbs: If using breadcrumbs, sprinkle them evenly over the cheese layer.
Step 4: Bake the Cauliflower Gratin – Golden Brown Perfection
Baking the gratin until golden brown and bubbly is the final step to achieve that classic gratin texture and flavor.
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- Bake in Preheated Oven: Bake in the preheated oven for 20-25 minutes, or until the gratin is golden brown and bubbly, and the cheese is melted and nicely browned. The gratin is done when the cheese is melted and bubbly, and the top is golden brown.
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- Broil for Extra Browning (Optional): For an extra golden-brown and crispy top, you can broil the gratin for the last 1-2 minutes of baking. Watch carefully to prevent burning. Broiling adds a final touch of browning and crispiness to the cheese topping.
Step 5: Rest and Serve – Enjoy the Creamy Goodness
Resting the gratin briefly before serving allows it to set slightly and makes it easier to serve.
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- Let Rest Briefly: Remove the Cauliflower Gratin from the oven and let it rest for 5-10 minutes before serving. Resting allows the gratin to set slightly, making it easier to slice and serve, and prevents it from being too runny.
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- Garnish (Optional): Garnish with fresh thyme sprigs, if desired, for a touch of freshness and visual appeal.
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- Serve Hot: Serve Cauliflower Gratin hot as a side dish. It’s best enjoyed warm, when the sauce is creamy and the cheese is melted and gooey.
Nutrition
- Serving Size: one normal portion
- Calories: 350-450
- Fat: 25-35 grams
- Carbohydrates: 10-15 grams
- Fiber: 3-4 grams
- Protein: 15-20 grams





