Caramelized Onion and Gruyère Tart

Highlighted under: Treats & Confections

This Caramelized Onion and Gruyère Tart is a savory delight, perfect for any occasion. The sweet, caramelized onions paired with rich Gruyère cheese create a delectable flavor combination that is sure to impress.

Emma

Created by

Emma

Last updated on 2026-01-04T06:14:29.241Z

This tart is a delightful way to showcase the sweet, rich flavors of caramelized onions. Combined with the nutty taste of Gruyère cheese, it's a dish that can be served as an appetizer or a main course.

Why You Will Love This Tart

  • Sweet and savory flavor combination
  • Rich, creamy Gruyère cheese
  • Perfect for gatherings and special occasions

The Perfect Balance of Flavors

Caramelized onions bring a natural sweetness to this tart, perfectly balancing the savory notes of Gruyère cheese. The slow cooking process enhances the onions' flavor, transforming them into a rich, golden topping that adds depth to every bite. Paired with the creamy texture of the cheese, this dish creates a symphony of flavors that delights the palate.

The combination of sweet and savory is a hallmark of many classic dishes, and this tart is no exception. The subtle sweetness from the onions pairs beautifully with the nutty, slightly sharp taste of Gruyère. This contrast not only elevates the dish’s flavor but also makes it an exciting option for those looking to impress their guests with an elegant yet comforting meal.

Versatile Serving Options

This Caramelized Onion and Gruyère Tart is incredibly versatile, making it suitable for a variety of occasions. Whether served as an appetizer at a dinner party or as a main course alongside a crisp salad, this tart can adapt to your dining needs. Its rich flavors and appealing presentation make it a delightful addition to any menu.

You can also customize this tart with additional ingredients. Consider adding sautéed mushrooms, spinach, or even a sprinkle of fresh herbs to enhance the flavor profile. This adaptability allows you to create a dish that fits your taste preferences or seasonal offerings, ensuring that you can serve this delicious tart throughout the year.

Ideal for Meal Prep

One of the great advantages of this tart is its ability to be made ahead of time. You can prepare the caramelized onions and even bake the tart a day in advance. Simply reheat it in the oven before serving, allowing the cheese to regain its creamy texture and the crust to crisp up again. This feature is especially useful for busy weeknights or when entertaining guests, as it reduces stress and saves time without sacrificing flavor.

Additionally, leftover tart can be stored in the refrigerator for a few days, making it a fantastic option for lunch or a quick snack. Enjoy it warm or cold; the flavors continue to meld beautifully even after the initial baking, providing you with a delicious meal ready at a moment's notice.

Ingredients

For the tart

  • 1 pre-made pie crust
  • 3 large onions, thinly sliced
  • 2 tablespoons olive oil
  • 2 tablespoons unsalted butter
  • 1 teaspoon sugar
  • Salt and pepper to taste
  • 1 cup Gruyère cheese, grated
  • 2 large eggs
  • 1 cup heavy cream
  • Fresh thyme for garnish

Make sure to slice the onions thinly for even caramelization.

Instructions

Caramelize the onions

In a large skillet over medium heat, combine olive oil and butter. Add the sliced onions, sugar, and a pinch of salt. Cook, stirring occasionally, for about 25-30 minutes until the onions are golden brown and caramelized.

Prepare the tart

Preheat your oven to 375°F (190°C). Place the pre-made pie crust in a tart pan and prick the bottom with a fork. Blind bake the crust for 10 minutes, then remove from oven.

Mix the filling

In a bowl, whisk together the eggs and heavy cream. Stir in the caramelized onions and grated Gruyère. Season with salt and pepper.

Bake the tart

Pour the onion and cheese mixture into the pre-baked crust. Bake for 25-30 minutes or until the filling is set and the top is lightly golden.

Serve

Let the tart cool for a few minutes before slicing. Garnish with fresh thyme and serve warm or at room temperature.

Enjoy your delicious tart with a fresh salad or as part of a charcuterie board.

Perfect Pairings

When serving this Caramelized Onion and Gruyère Tart, consider pairing it with a light white wine, such as a Sauvignon Blanc or a Chardonnay. The crisp acidity of these wines complements the rich flavors of the tart while refreshing the palate. For non-alcoholic options, a sparkling water with a splash of lemon can work wonderfully to enhance the dish's flavors.

This tart also pairs excellently with a simple side salad dressed in a light vinaigrette. The freshness of the greens will contrast nicely with the richness of the tart, creating a well-rounded meal that satisfies both the taste buds and the appetite.

Storage Tips

To store leftover Caramelized Onion and Gruyère Tart, allow it to cool completely before covering it tightly with plastic wrap or aluminum foil. It can be kept in the refrigerator for up to four days. If you want to extend its shelf life, consider freezing it. Wrap the tart in plastic wrap and then in aluminum foil to prevent freezer burn, and it can last for up to two months.

When ready to enjoy, thaw the tart in the refrigerator overnight before reheating it in the oven. This method ensures that the texture remains intact and the flavors are revived, allowing you to savor the deliciousness of this tart even after several days.

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Questions About Recipes

→ Can I make the tart ahead of time?

Yes, you can prepare the tart in advance and reheat it in the oven before serving.

→ What can I substitute for Gruyère cheese?

You can use Swiss cheese or a blend of mozzarella and Parmesan for a different flavor.

→ How do I store leftovers?

Store any leftovers in an airtight container in the refrigerator for up to 3 days.

→ Can I freeze the tart?

Yes, you can freeze the unbaked tart for up to 2 months. Thaw and bake when ready to serve.

Caramelized Onion and Gruyère Tart

This Caramelized Onion and Gruyère Tart is a savory delight, perfect for any occasion. The sweet, caramelized onions paired with rich Gruyère cheese create a delectable flavor combination that is sure to impress.

Prep Time20 minutes
Cooking Duration40 minutes
Overall Time60 minutes

Created by: Emma

Recipe Type: Treats & Confections

Skill Level: Intermediate

Final Quantity: 8 servings

What You'll Need

For the tart

  1. 1 pre-made pie crust
  2. 3 large onions, thinly sliced
  3. 2 tablespoons olive oil
  4. 2 tablespoons unsalted butter
  5. 1 teaspoon sugar
  6. Salt and pepper to taste
  7. 1 cup Gruyère cheese, grated
  8. 2 large eggs
  9. 1 cup heavy cream
  10. Fresh thyme for garnish

How-To Steps

Step 01

In a large skillet over medium heat, combine olive oil and butter. Add the sliced onions, sugar, and a pinch of salt. Cook, stirring occasionally, for about 25-30 minutes until the onions are golden brown and caramelized.

Step 02

Preheat your oven to 375°F (190°C). Place the pre-made pie crust in a tart pan and prick the bottom with a fork. Blind bake the crust for 10 minutes, then remove from oven.

Step 03

In a bowl, whisk together the eggs and heavy cream. Stir in the caramelized onions and grated Gruyère. Season with salt and pepper.

Step 04

Pour the onion and cheese mixture into the pre-baked crust. Bake for 25-30 minutes or until the filling is set and the top is lightly golden.

Step 05

Let the tart cool for a few minutes before slicing. Garnish with fresh thyme and serve warm or at room temperature.

Nutritional Breakdown (Per Serving)

  • Calories: 300 kcal
  • Total Fat: 22g
  • Saturated Fat: 12g
  • Cholesterol: 150mg
  • Sodium: 400mg
  • Total Carbohydrates: 20g
  • Dietary Fiber: 1g
  • Sugars: 3g
  • Protein: 6g