Description
A savory tart featuring sweet, deeply caramelized onions baked in a flaky crust.
Ingredients
- 1 sheet puff pastry, thawed
- 2 tablespoons olive oil
- 3 large yellow onions, thinly sliced
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1/4 cup grated Parmesan cheese
- 1 egg, beaten (for egg wash)
Instructions
- Preheat your oven to 400°F (200°C).
- Heat olive oil in a large skillet over medium-low heat. Add sliced onions, salt, and pepper. Cook slowly, stirring occasionally, for 30-45 minutes, or until onions are deeply golden brown and very soft.
- Unroll the puff pastry onto a lightly floured surface. Score a 1-inch border around the edges with a knife, being careful not to cut all the way through. Prick the center area with a fork.
- Spread the caramelized onions evenly over the puff pastry within the scored border. Sprinkle with Parmesan cheese.
- Brush the scored border with the beaten egg wash.
- Bake for 20-25 minutes, or until the pastry is golden brown and puffed.
- Let cool slightly before slicing and serving.
Notes
- For extra flavor, you can add a splash of balsamic vinegar to the onions during the last 10 minutes of caramelizing.
- This tart is delicious served warm or at room temperature.
- Prep Time: 15 minutes
- Cook Time: 45 minutes
- Category: Appetizer
- Method: Baking
- Cuisine: French