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When it comes to delightful, crowd-pleasing dishes that marry texture and flavor, few can rival the Sweet & Savory Caramelized Onion Gruyère Tart. This dish is a harmonious blend of sweet caramelized onions, nutty Gruyère cheese, and a flaky pastry crust, creating an experience that is both indulgent and comforting. Perfect for brunch, a light dinner, or as an elegant appetizer at a gathering, this tart has solidified its place in both home kitchens and high-end restaurants.

Caramelized Onion Gruyère Tart

Indulge in the delightful flavors of a Sweet & Savory Caramelized Onion Gruyère Tart! This exquisite dish features a flaky pastry crust filled with sweet caramelized onions and rich Gruyère cheese, making it an elegant choice for brunch, a casual dinner, or a sophisticated appetizer. Rooted in French culinary tradition, this tart highlights the beauty of simple, quality ingredients. Perfect for gatherings or a cozy night in, it's a comforting yet refined treat that showcases your culinary skills. Dive into this versatile recipe that's sure to impress!
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Ingredients
  

1 sheet of puff pastry (thawed)

3 large yellow onions, thinly sliced

2 tablespoons olive oil

1 tablespoon unsalted butter

1 tablespoon sugar (brown sugar preferred)

1 teaspoon salt

½ teaspoon black pepper

1 teaspoon fresh thyme leaves (plus more for garnish)

200g (about 7 oz) Gruyère cheese, grated

2 large eggs

1 cup heavy cream

1 teaspoon Dijon mustard

Optional: balsamic glaze for drizzling

Instructions
 

Preheat the Oven: Preheat your oven to 400°F (200°C).

    Prepare the Puff Pastry: Roll out the thawed puff pastry on a lightly floured surface to fit your tart pan (approximately 11 inches). Transfer the pastry into the tart pan and trim any excess edges.

      Caramelize the Onions: In a large skillet, heat olive oil and butter over medium heat. Add the sliced onions, sugar, salt, and pepper. Sauté the onions, stirring occasionally, for about 25-30 minutes until they are soft and caramelized. Add the fresh thyme leaves in the last 5 minutes of cooking.

        Mix the Custard: In a mixing bowl, whisk together the eggs, heavy cream, and Dijon mustard until well combined. Season with a pinch of salt and pepper.

          Assemble the Tart: Spread the caramelized onions evenly over the prepared puff pastry. Pour the egg and cream mixture over the onions and sprinkle the grated Gruyère cheese on top.

            Bake the Tart: Place the tart in the preheated oven and bake for 35-40 minutes or until the filling is set and the pastry is golden brown.

              Cool and Garnish: Once out of the oven, let the tart cool for about 10 minutes. Garnish with extra fresh thyme leaves and drizzle with balsamic glaze if desired.

                Slice and Serve: Cut the tart into wedges and serve warm or at room temperature. Enjoy your savory delight!

                  Prep Time, Total Time, Servings: 15 mins | 1 hour | 6 servings