Onion Gruyere Tarts
Onion Gruyere Tarts are a timeless classic that beautifully combines the rich, sweet flavor of caramelized onions with the nutty, creamy taste of Gruyere cheese.
Equipment
- Large Skillet
- Baking Sheet
- Parchment Paper
- Mixing Bowl
Ingredients
Ingredients
- 1 sheet Puff Pastry Thawed if frozen.
- 2 large Onions Preferably yellow or sweet, sliced thinly.
- 2 tablespoons Olive Oil For sautéing the onions.
- 1 teaspoon Fresh Thyme Leaves Or 1/2 teaspoon dried thyme.
- to taste Salt For enhancing flavors.
- to taste Freshly Ground Black Pepper For added warmth and depth.
- 1 cup Grated Gruyere Cheese For topping the tarts.
- 1 large Egg For egg wash.
- optional Balsamic Vinegar or White Wine For added depth while caramelizing onions.
Instructions
- Preheat the oven to 400°F (200°C).
- Roll out the thawed puff pastry sheet on a lightly floured surface to about 1/8 inch thick. Cut into squares or circles.
- Chill the cut pastry shapes on a baking sheet lined with parchment paper for about 15 minutes.
- Heat olive oil in a large skillet over medium heat. Add sliced onions and a pinch of salt. Cook until soft and golden brown, about 15-20 minutes.
- Stir in thyme leaves and season with salt and pepper. Remove from heat and let cool slightly.
- Score a smaller rectangle or circle inside each pastry piece, about 1/2 inch from the edge. Spoon the onion mixture into the center.
- Sprinkle grated Gruyere cheese over the onion filling.
- Beat the egg and brush it over the edges of the pastry.
- Bake for about 20-25 minutes until the pastry is puffed and golden brown, and the cheese is melted.
- Let cool for a few minutes before serving warm or at room temperature.
Notes
These tarts can be prepared in advance and baked just before serving for the best texture.