Description
This Caramelized Onion Tarts recipe features a flaky puff pastry base topped with sweet, deeply caramelized onions, savory cheeses, and a touch of fresh herbs. Perfect as an elegant appetizer or a delightful snack, these tarts blend rich flavors and textures with a simple preparation that bakes to golden perfection.
Ingredients
Scale
Pastry
- 1 sheet puff pastry, thawed
Caramelized Onions
- 3 large yellow onions, thinly sliced
- 2 tablespoons unsalted butter
- 1 tablespoon olive oil
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 teaspoon sugar
- 2 cloves garlic, minced
- 1 teaspoon fresh thyme leaves
- 1 tablespoon balsamic vinegar
Cheese and Toppings
- 1/4 cup grated Parmesan cheese
- 1/2 cup shredded Gruyere cheese
- 1/4 cup heavy cream
- 1 egg, beaten (for egg wash)
- Fresh parsley for garnish
Instructions
- Preheat oven and prepare baking sheet: Preheat your oven to 400°F (204°C) and line a baking sheet with parchment paper to prevent the pastry from sticking.
- Caramelize onions: In a large skillet over medium heat, melt the butter with olive oil. Add sliced onions, salt, pepper, and sugar. Cook slowly for 20 to 25 minutes, stirring occasionally, until the onions turn a deep golden brown and are caramelized.
- Add flavorings: Stir in the minced garlic, fresh thyme leaves, and balsamic vinegar. Cook for another 1 to 2 minutes until fragrant, then remove from heat and allow to cool slightly.
- Prepare puff pastry: Roll out the thawed puff pastry on the prepared baking sheet. Lightly score a 1-inch border around the edges of the pastry without cutting all the way through. Prick the center of the pastry with a fork to prevent it from puffing excessively.
- Assemble tart: Spread the caramelized onions evenly over the center section of the pastry. Sprinkle grated Parmesan and shredded Gruyere cheeses on top. Drizzle with heavy cream for richness.
- Apply egg wash: Brush the edges of the puff pastry with the beaten egg to achieve a glossy, golden finish during baking.
- Bake: Place the tart in the preheated oven and bake for 20 to 25 minutes, or until the pastry is puffed and golden brown.
- Garnish and serve: Let the tart cool slightly, then garnish with fresh parsley. Slice into portions and serve warm or at room temperature.
Notes
- For added depth of flavor, try mixing sautéed mushrooms into the caramelized onions before spreading on the pastry.
- A sprinkle of goat cheese on top can make for a tangy twist.
- These tarts are delicious warm or at room temperature, making them great for make-ahead entertaining.
