30-Minute Caramelized Onion Tart That Tastes Heavenly
A savory caramelized onion tart with a flaky crust and rich, sweet onion filling.
- Prep Time: 15 minutes
- Cook Time: 55 minutes
- Total Time: 70 minutes
- Yield: 6 servings 1x
- Category: Appetizer
- Method: Baking
- Cuisine: French
- Diet: Vegetarian
Ingredients
Scale
- 2 large onions, thinly sliced
- 2 tbsp butter
- 1 tbsp olive oil
- 1 tsp sugar
- 1 tsp salt
- 1 sheet puff pastry, thawed
- 1/2 cup grated cheese (Gruyère or Parmesan)
- 1 egg, beaten (for egg wash)
Instructions
- Heat butter and olive oil in a pan over medium heat.
- Add onions, sugar, and salt. Cook for 25-30 minutes until caramelized.
- Preheat oven to 375°F (190°C).
- Roll out puff pastry on a baking sheet.
- Spread caramelized onions evenly over the pastry.
- Sprinkle cheese on top.
- Brush edges with egg wash.
- Bake for 20-25 minutes until golden brown.
- Let cool slightly before serving.
Notes
- Use a sharp knife for thinly slicing onions.
- Stir onions occasionally for even caramelization.
- Let the tart rest for 5 minutes before cutting.
Nutrition
- Serving Size: 1 slice
- Calories: 280
- Sugar: 5g
- Sodium: 320mg
- Fat: 18g
- Saturated Fat: 8g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 22g
- Fiber: 2g
- Protein: 6g
- Cholesterol: 45mg