Description
Indulge in the rich flavors of this Caramelized Onion Tart with Gruyere and Thyme. The sweet caramelized onions paired with the nutty Gruyere cheese make for a delightful combination atop a flaky puff pastry crust.
Ingredients
Scale
- 1 sheet puff pastry (thawed)
- 2 tablespoons olive oil
- 2 tablespoons unsalted butter
- 3 large yellow onions (thinly sliced)
- 1 teaspoon fresh thyme leaves (plus more for garnish)
- 1/2 teaspoon salt
- 1/4 teaspoon black pepper
- 1 teaspoon balsamic vinegar
- 1 cup shredded Gruyere cheese
- 1 egg (beaten, for egg wash)
Puff Pastry:
Caramelized Onions:
Additional Ingredients:
Instructions
- Preheat the oven: Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
- Caramelize the Onions: In a large skillet, heat olive oil and butter. Add onions, salt, pepper, and thyme. Cook until caramelized, then stir in balsamic vinegar.
- Prepare the Pastry: Roll out puff pastry, score a border, brush with egg wash, spread caramelized onions, and top with Gruyere.
- Bake: Bake for 20–25 minutes until golden and crisp. Garnish with thyme before serving.
Notes
- You can prepare the caramelized onions in advance and refrigerate until ready to use.
- For a deeper flavor, add a splash of white wine or sherry while caramelizing the onions.
Nutrition
- Serving Size: 1 slice
- Calories: 280
- Sugar: 5g
- Sodium: 270mg
- Fat: 19g
- Saturated Fat: 10g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 22g
- Fiber: 2g
- Protein: 6g
- Cholesterol: 40mg
