Caramelized Onion and Gruyère Tart

Name: Caramelized Onion and Gruyère Tart
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Yield: 8 servings
Ingredients: 1 sheet of puff pastry, thawed; 3 large onions, thinly sliced; 2 tablespoons olive oil; 1 teaspoon sugar; Salt and pepper to taste; 1 cup Gruyère cheese, grated; 2 large eggs; 1/2 cup heavy cream; 1 teaspoon fresh thyme leaves

Highlighted under: Cozy Meal Favorites

Indulge in the rich flavors of caramelized onions paired with creamy Gruyère cheese in this delightful tart. Perfect for a light lunch or a sophisticated appetizer.

Created by

Noah

Last updated on 2026-01-04T02:30:30.070Z

This Caramelized Onion and Gruyère Tart combines the sweetness of slow-cooked onions with the nutty flavor of Gruyère cheese, all nestled in a flaky pastry crust. A perfect dish for entertaining or a cozy family meal!

        Why You'll Love This Tart
        Rich, sweet flavor of caramelized onions
Creamy, nutty Gruyère cheese that adds depth
Versatile dish perfect for any occasion

      

The Perfect Combination of Flavors

Caramelized onions are a culinary treasure, bringing a sweet and savory depth to any dish. Their slow-cooked sweetness beautifully complements the nutty flavor of Gruyère cheese, creating a harmonious balance that's hard to resist. This tart is not just a dish; it's a celebration of flavors that dance on your palate.

The rich, buttery notes of puff pastry provide a flaky foundation that elevates the entire tart. Each bite offers a delightful contrast between the crispy crust and the creamy filling, making it a textural delight. The combination of these ingredients results in a tart that's both indulgent and comforting.

Versatility for Every Occasion

This Caramelized Onion and Gruyère Tart is a versatile dish that can be enjoyed in various settings. Whether you're hosting a brunch, a casual lunch, or a sophisticated dinner, this tart fits seamlessly into any menu. It's easy to prepare ahead of time, allowing you to spend more time with your guests and less time in the kitchen.

Pair it with a light salad for a refreshing lunch or serve it as an appetizer at your next gathering. It also makes for a delicious snack when served warm or at room temperature. The tart can be customized with additional ingredients like spinach or mushrooms, making it a perfect canvas for your culinary creativity.

Tips for Success

Ingredients

For the Tart

1 sheet of puff pastry, thawed
3 large onions, thinly sliced
2 tablespoons olive oil
1 teaspoon sugar
Salt and pepper to taste
1 cup Gruyère cheese, grated
2 large eggs
1/2 cup heavy cream
1 teaspoon fresh thyme leaves

Ensure all ingredients are at room temperature for best results.

Instructions

Prepare the Pastry

Preheat your oven to 400°F (200°C). Roll out the puff pastry on a lightly floured surface and fit it into a tart pan. Trim any excess pastry and prick the bottom with a fork. Set aside.

Caramelize the Onions

In a large skillet, heat the olive oil over medium heat. Add the sliced onions and sprinkle with sugar, salt, and pepper. Cook, stirring occasionally, until the onions are soft and caramelized, about 25 minutes.

Assemble the Tart

Spread the caramelized onions evenly over the pastry. In a bowl, whisk together the eggs, heavy cream, thyme, and a pinch of salt and pepper. Pour the mixture over the onions and top with grated Gruyère cheese.

Bake the Tart

Bake the tart in the preheated oven for 25-30 minutes, or until the filling is set and the cheese is golden brown. Allow it to cool slightly before slicing and serving.

Serve warm or at room temperature, garnished with extra thyme if desired.

Serving Suggestions

This delectable tart pairs beautifully with a fresh green salad dressed in vinaigrette. The acidity of the dressing cuts through the richness of the cheese and onions, creating a balanced meal. For a more substantial offering, serve it alongside roasted vegetables or a light soup.

Wine enthusiasts will appreciate a crisp white wine, such as Sauvignon Blanc or a light-bodied red like Pinot Noir, which complements the flavors of the tart wonderfully. These beverages enhance the overall dining experience, making your meal feel even more special.

Storing and Reheating

If you have leftovers, store the tart in an airtight container in the refrigerator for up to three days. To reheat, simply place it in a preheated oven at 350°F (175°C) for about 10-15 minutes, until warmed through. This helps maintain the pastry's crispness while reviving the delicious flavors.

Alternatively, you can freeze the tart before baking. Wrap it tightly in plastic wrap and foil, and it will keep for up to three months. When ready to enjoy, bake it directly from the freezer; just add an extra 10-15 minutes to the baking time. This is a great way to have a gourmet dish ready for unexpected guests!

Questions About Recipes

→ Can I make this tart in advance?

Yes, you can prepare the tart a day in advance and bake it just before serving.

→ What can I serve with this tart?

This tart pairs well with a fresh green salad or a bowl of soup.

→ Can I use a different cheese?

Absolutely! Other cheeses like cheddar or feta can also work well.

→ How do I store leftovers?

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