Description
This Caramelized Onion and Gruyère Tart combines a flaky puff pastry base with sweet, deeply caramelized onions and nutty Gruyère cheese, all topped with aromatic fresh thyme. Baked to golden perfection, this savory tart is ideal for a flavorful 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 prepare for baking the tart.
- Caramelize Onions: In a skillet over medium heat, combine 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 with salt, pepper, and fresh thyme leaves for extra flavor.
- Prepare Pastry: On a floured surface, roll out the thawed puff pastry sheet to fit your tart pan. Transfer the rolled-out pastry to the pan and prick the bottom with a fork to prevent puffing during baking.
- Assemble Tart: Evenly spread the caramelized onions over the puff pastry base. Then sprinkle the grated Gruyère cheese over the onions to cover the surface.
- Apply Egg Wash: Brush the edges of the puff pastry with the beaten egg to ensure a golden, shiny crust after baking.
- Bake Tart: Place the tart in the preheated oven and bake for 25-30 minutes, or until the pastry is golden brown and the cheese is melted and bubbling.
- Cool and Serve: Allow the tart to cool slightly before slicing. Serve warm for best taste and texture.
Notes
- You can substitute Gruyère cheese with Swiss or Emmental if unavailable.
- Ensure onions are cooked slowly to achieve a deep caramelization without burning.
- Use fresh thyme for the best aromatic flavor; dried thyme can be used but reduce quantity by half.
- Letting the tart cool slightly helps the cheese set, making it easier to slice.
- For a crispier crust, blind bake the puff pastry for 5 minutes before adding toppings.
