Description
These Upside-Down Onion and Gruyere Tarts combine sweet caramelized onions, rich Gruyere cheese, and fragrant fresh thyme all layered beneath flaky puff pastry. Finished with a drizzle of honey, these savory tarts offer a perfect balance of sweet and savory flavors, ideal for an elegant appetizer or a delicious snack.
Ingredients
Scale
Pastry
- 1 sheet of puff pastry, thawed
Filling
- 1 yellow onion, thinly sliced
- 18 pieces thinly sliced Gruyere cheese (or as needed)
- Fresh thyme leaves, to taste
- Salt, to taste
- Black pepper, to taste
Additional
- 3 tablespoons honey or homemade hot honey, divided
- 1 egg, beaten (for egg wash)
Instructions
- Preheat Oven: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper to prepare for baking the tarts.
- Create Honey Bases: Drizzle small amounts of hot honey onto the parchment-lined baking sheet in 9 separate spots, which will serve as a sweet base for each tart.
- Prepare Puff Pastry: Cut the thawed puff pastry sheet into 9 equal rectangles to form individual tarts.
- Assemble Tarts: Sprinkle fresh thyme leaves, salt, and black pepper over each honey drizzle spot. Layer a slice of thinly sliced yellow onion on top, followed by 1-2 thin slices of Gruyere cheese. Place a puff pastry rectangle on top of each stack to cover the filling.
- Apply Egg Wash: Brush the tops of each puff pastry tart with the beaten egg to achieve a golden, glossy finish.
- Bake: Transfer the baking sheet to the preheated oven and bake for about 20 minutes or until the pastry is puffed and golden brown.
- Flip and Finish: Remove the tarts from the oven and carefully flip each tart over with a spatula so the onion and cheese side is on top. Drizzle additional hot honey over each tart and sprinkle with fresh thyme leaves.
- Serve: Allow the tarts to cool slightly before serving. These tarts are best enjoyed warm for optimal flavor and texture.
Notes
- Use homemade hot honey or store-bought honey infused with chili flakes to add a subtle spicy kick.
- Ensure the puff pastry is fully thawed before cutting to prevent cracking.
- Be gentle when flipping the tarts after baking to keep the toppings intact.
- These tarts can be prepared ahead of time and baked just before serving for convenience.
- For a vegetarian diet, ensure the honey is acceptable or substitute with maple syrup for a vegan alternative, although that changes the flavor profile.
Nutrition
- Serving Size: 1 tart
- Calories: 220 kcal
- Sugar: 5 g
- Sodium: 150 mg
- Fat: 14 g
- Saturated Fat: 7 g
- Unsaturated Fat: 6 g
- Trans Fat: 0 g
- Carbohydrates: 16 g
- Fiber: 1 g
- Protein: 6 g
- Cholesterol: 35 mg
