Golden Caramelized Onion & Gruyère Puff Pastry Tart
Indulge in the delightful flavors of Golden Caramelized Onion & Gruyère Puff Pastry Tart, a savory treat that combines sweet, golden onions with rich Gruyère cheese, all enveloped in a flaky puff pastry. Perfect for any occasion, this tart serves as an elegant appetizer or a charming addition to brunch. With its visually stunning presentation and satisfying taste, it’s sure to impress your guests while being easy enough for home cooks of all skill levels.
- Prep Time: 20 minutes
- Cook Time: 35 minutes
- Total Time: 55 minutes
- Yield: Serves 8
- Category: Appetizer
- Method: Baking
- Cuisine: French
Ingredients
Scale
- 1 sheet puff pastry (thawed)
- 3 large yellow onions (thinly sliced)
- 2 tbsp butter
- 1 tbsp olive oil
- 1 cup shredded Gruyère cheese
- ¼ cup heavy cream
- 1 egg (beaten for brushing)
- Fresh thyme leaves (for flavor)
- 1 tbsp Dijon mustard (optional)
- 1 tsp sugar
- Salt to taste
- ½ tsp black pepper
Instructions
- In a large skillet, melt the butter and olive oil over medium heat. Add the sliced onions, sugar, and a pinch of salt. Cook slowly for about 25–30 minutes until the onions are golden brown and jammy.
- Preheat your oven to 400°F (200°C).
- Place the puff pastry on a parchment-lined baking sheet. Score a 1-inch border around the edges and prick the inner section with a fork. Brush the edges with beaten egg and bake for 10 minutes.
- In a bowl, whisk together cream, egg, pepper, and Gruyère cheese. Spread Dijon mustard over the pre-baked pastry base if using.
- Pour the cheese mixture into the tart shell and top with caramelized onions.
- Bake for an additional 15–18 minutes until puffed and golden brown. Garnish with fresh thyme before serving.
Nutrition
- Serving Size: 1/8 tart (approx. 85g)
- Calories: 250
- Sugar: 3g
- Sodium: 350mg
- Fat: 16g
- Saturated Fat: 8g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 22g
- Fiber: 1g
- Protein: 7g
- Cholesterol: 45mg