CategoryAppetizers, Bites/Snacks, Vegetarian
These Caramelized Onion and Gruyère Tartlets are flaky, buttery, and filled with deeply caramelized onions and rich, nutty Gruyère cheese. They are the perfect appetizer or snack, offering a balance of sweet and savory flavors with a crispy pastry crust. Serve them as an elegant starter for a French-inspired meal or a holiday gathering.
(Makes 12 Tartlets)
For the Caramelized Onions
2 large onions (thinly sliced)
2 tbsp unsalted butter
1 tbsp olive oil
1 tsp sugar (optional, to enhance caramelization)
½ tsp salt
¼ tsp black pepper
1 tsp balsamic vinegar (for extra depth, optional)
For the Tartlets
1 sheet puff pastry (thawed)
1 cup Gruyère cheese (grated)
1 egg (beaten, for egg wash)
1 tsp Dijon mustard (optional, for extra tang)
½ tsp fresh thyme leaves (for garnish)
Caramelize the Onions
1
- Heat Butter and Oil:
- In a skillet over medium heat, melt butter and olive oil.
- Cook the Onions:
- Add sliced onions, salt, and sugar, stirring occasionally.
- Cook for 25-30 minutes, until golden brown and caramelized.
- Add Vinegar and Season:
- Stir in balsamic vinegar, cook for 2 minutes, then set aside.
Prepare the Tartlet Shells
2
- Preheat the Oven:
- Set to 375°F (190°C).
- Cut the Puff Pastry:
- Roll out the puff pastry and cut into 12 equal squares or circles.
- Place them into a muffin tin or on a lined baking sheet.
- Brush with Dijon (Optional):
- Spread a thin layer of Dijon mustard on each pastry.
Assemble and Bake
3
- Fill the Tartlets:
- Spoon caramelized onions into each pastry shell.
- Sprinkle with Gruyère cheese.
- Brush with Egg Wash:
- Lightly brush the edges of the pastry with beaten egg for a golden crust.
- Bake Until Golden:
- Bake for 15-18 minutes, until puffed and golden brown.
Garnish and Serve
4
- Add Fresh Herbs:
- Sprinkle with fresh thyme for an aromatic finish.
- Pair with a Side:
- Serve with a light salad or a glass of white wine.
Pro Tips
5
- For Extra Crispiness: Pre-bake the puff pastry for 5 minutes before adding the filling.
- Make Ahead: Caramelize the onions a day in advance for easy assembly.
- Try a Different Cheese: Swap Gruyère for Brie, Comté, or aged cheddar.
Ingredients
(Makes 12 Tartlets)
For the Caramelized Onions
2 large onions (thinly sliced)
2 tbsp unsalted butter
1 tbsp olive oil
1 tsp sugar (optional, to enhance caramelization)
½ tsp salt
¼ tsp black pepper
1 tsp balsamic vinegar (for extra depth, optional)
For the Tartlets
1 sheet puff pastry (thawed)
1 cup Gruyère cheese (grated)
1 egg (beaten, for egg wash)
1 tsp Dijon mustard (optional, for extra tang)
½ tsp fresh thyme leaves (for garnish)
Directions
Caramelize the Onions
1
- Heat Butter and Oil:
- In a skillet over medium heat, melt butter and olive oil.
- Cook the Onions:
- Add sliced onions, salt, and sugar, stirring occasionally.
- Cook for 25-30 minutes, until golden brown and caramelized.
- Add Vinegar and Season:
- Stir in balsamic vinegar, cook for 2 minutes, then set aside.
Prepare the Tartlet Shells
2
- Preheat the Oven:
- Set to 375°F (190°C).
- Cut the Puff Pastry:
- Roll out the puff pastry and cut into 12 equal squares or circles.
- Place them into a muffin tin or on a lined baking sheet.
- Brush with Dijon (Optional):
- Spread a thin layer of Dijon mustard on each pastry.
Assemble and Bake
3
- Fill the Tartlets:
- Spoon caramelized onions into each pastry shell.
- Sprinkle with Gruyère cheese.
- Brush with Egg Wash:
- Lightly brush the edges of the pastry with beaten egg for a golden crust.
- Bake Until Golden:
- Bake for 15-18 minutes, until puffed and golden brown.
Garnish and Serve
4
- Add Fresh Herbs:
- Sprinkle with fresh thyme for an aromatic finish.
- Pair with a Side:
- Serve with a light salad or a glass of white wine.
Pro Tips
5
- For Extra Crispiness: Pre-bake the puff pastry for 5 minutes before adding the filling.
- Make Ahead: Caramelize the onions a day in advance for easy assembly.
- Try a Different Cheese: Swap Gruyère for Brie, Comté, or aged cheddar.
Notes
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