Description
This Caramelized Onion and Gruyère Tart is a savory, flaky puff pastry tart topped with sweet, slow-cooked caramelized onions and melted Gruyère cheese, enhanced with fresh thyme. Perfect as a sophisticated appetizer or light meal, this savory tart combines rich flavors and a delightful texture with a golden, crispy crust.
Ingredients
Scale
Pastry
- 1 sheet puff pastry (thawed)
Filling
- 2 large onions, thinly sliced
- 2 tablespoons olive oil
- 1 tablespoon butter
- 1 cup Gruyère cheese, grated
- 1 tablespoon fresh thyme leaves
- Salt and pepper to taste
Egg Wash
- 1 egg (beaten, for egg wash)
Instructions
- Preheat Oven: Preheat your oven to 400°F (200°C) to prepare for baking the tart.
- Caramelize Onions: In a skillet over medium heat, warm the olive oil and butter. Add the thinly sliced onions and cook, stirring occasionally, for 20-25 minutes until they become golden brown and caramelized. Season with salt, pepper, and fresh thyme leaves to infuse flavor.
- Prepare Puff Pastry: On a floured surface, roll out the thawed puff pastry sheet to fit your tart pan. Transfer the rolled pastry onto the pan and prick the bottom with a fork to prevent excessive puffing during baking.
- Assemble Tart: Evenly spread the caramelized onions over the pastry base, then sprinkle the grated Gruyère cheese evenly on top.
- Apply Egg Wash: Brush the edges of the pastry with the beaten egg to ensure a beautiful golden finish when baked.
- Bake: Place the tart in the preheated oven and bake for 25-30 minutes or until the pastry is golden and crisp, and the cheese is bubbly and melted.
- Cool and Serve: Remove the tart from the oven and allow it to cool slightly before slicing. Serve warm or at room temperature.
Notes
- Ensure onions are cooked low and slow to achieve perfect caramelization without burning.
- You can substitute Gruyère with other melting cheeses like Emmental or Comté if preferred.
- For extra garnish, sprinkle fresh thyme leaves or chopped parsley before serving.
- This tart is delicious served alongside a crisp green salad.
- Make sure puff pastry is fully thawed before rolling to prevent cracking.
