Description
A delicious Caramelized Onion and Gruyère Tart featuring sweet, slow-cooked onions layered on flaky puff pastry and topped with melted Gruyère cheese and fresh thyme. Perfect as a savory appetizer or light meal.
Ingredients
Scale
Puff Pastry
- 1 sheet puff pastry (thawed)
Caramelized Onions
- 2 large onions, thinly sliced
- 2 tablespoons olive oil
- 1 tablespoon butter
- Salt and pepper to taste
- 1 tablespoon fresh thyme leaves
Topping
- 1 cup Gruyère cheese, grated
- 1 egg (beaten, for egg wash)
Instructions
- Preheat Oven: Preheat your oven to 400°F (200°C) to ensure it is hot and ready for baking the tart.
- Caramelize Onions: In a skillet over medium heat, heat the olive oil and butter. Add the thinly sliced onions and cook for 20-25 minutes, stirring occasionally, until they become golden brown and caramelized. Season the onions with salt, pepper, and fresh thyme leaves, then remove from heat.
- Prepare Puff Pastry: On a floured surface, roll out the thawed puff pastry sheet to fit your tart pan. Transfer the rolled pastry into the pan, pressing gently to fit, 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 over the onions for a rich, savory layer.
- Apply Egg Wash: Brush the edges of the puff pastry with the beaten egg. This will give the crust a golden, glossy finish when baked.
- Bake Tart: Place the tart in the preheated oven and bake for 25-30 minutes until the puff pastry is puffed and golden brown and the cheese is melted and bubbling.
- Cool and Serve: Remove the tart from the oven and let it cool slightly before slicing. Serve warm or at room temperature.
Notes
- Make sure to cook the onions slowly over medium heat to fully caramelize and bring out their natural sweetness without burning.
- Thaw puff pastry completely before rolling to prevent cracking and ensure even puffing.
- You can substitute Gruyère cheese with Emmental or Comté for a similar flavor profile.
- Fresh thyme adds a lovely herbal note, but dried thyme can be used in a pinch.
- Serve with a simple green salad for a complete meal.
