Description
This Caramelized Onion and Gruyère Tart combines the sweetness of slowly caramelized onions with the rich, nutty flavor of Gruyère cheese, baked into a flaky puff pastry base. Topped with fresh thyme and a golden egg wash, this savory tart is perfect as an appetizer, brunch dish, 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, warm the olive oil and butter. Add the thinly sliced onions and cook for 20-25 minutes, stirring occasionally, until the onions are golden brown and caramelized. Season with salt, pepper, and sprinkle fresh thyme leaves evenly.
- Prepare Puff Pastry: On a floured surface, roll out the thawed puff pastry sheet to fit your tart pan. Transfer the pastry carefully to the pan and prick the bottom with a fork to prevent excessive puffing during baking.
- Assemble Tart: Spread the caramelized onions evenly over the puff pastry base. Then, sprinkle the grated Gruyère cheese uniformly on top of the onions.
- Apply Egg Wash: Brush the edges of the puff pastry with the beaten egg to help them turn golden and glossy when baked.
- 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: Remove the tart from the oven and allow it to cool slightly before slicing. Serve warm for best flavor and texture.
Notes
- You can substitute Gruyère with other melty cheeses like Emmental or Comté if unavailable.
- For an extra depth of flavor, add a splash of balsamic vinegar when caramelizing the onions.
- Use fresh thyme for best aromatic results; dried thyme can be used but in smaller quantities.
- Ensure the puff pastry is fully thawed before rolling to avoid cracking.
