Description
A savory and elegant Caramelized Onion and Gruyère Tart featuring sweet, slow-cooked onions layered on buttery puff pastry and topped with melted Gruyère cheese and fresh thyme. Perfect as an appetizer, brunch, or light meal.
Ingredients
Scale
For the Tart
- 1 sheet puff pastry (thawed)
- 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
- 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 the onions with salt, pepper, and fresh thyme leaves to enhance their flavor.
- Prepare Puff Pastry: On a floured surface, roll out the thawed puff pastry sheet to fit your tart pan. Transfer the pastry carefully into the pan and prick the bottom with a fork to prevent excessive puffing during baking.
- Assemble Tart: Evenly spread the caramelized onions over the puff pastry base. Sprinkle the grated Gruyère cheese evenly on top of the onions for a rich, melty layer.
- Apply Egg Wash: Brush the edges of the puff pastry with the beaten egg to help it develop a beautiful golden color while baking.
- Bake Tart: Place the tart in the preheated oven and bake for 25-30 minutes, or until the puff pastry is golden and crisp and the cheese is bubbling and slightly browned.
- Cool and Serve: Remove the tart from the oven and allow it to cool slightly before slicing and serving to let the flavors meld and the tart set.
Notes
- Use a sharp knife to thinly slice onions evenly for consistent caramelization.
- If puff pastry is not thawed, allow it to thaw in the refrigerator for several hours or overnight for best results.
- Fresh thyme can be substituted with dried thyme, but use less (about 1 teaspoon) as dried herbs are more concentrated.
- The tart is best served warm but can also be enjoyed at room temperature.
- Store leftover tart in an airtight container in the refrigerator for up to 3 days and reheat gently before serving.
