Ingredients with Measurements:
- 2 tablespoons olive oil
- 2 large sweet onions, thinly sliced
- 2 cloves garlic, minced
- 2 tablespoons balsamic vinegar
- 2 tablespoons brown sugar
- 1 teaspoon dried thyme
- 1/2 teaspoon salt
- 1/4 teaspoon freshly ground black pepper
- 1 sheet frozen puff pastry, thawed
- 2 tablespoons Dijon mustard
- 1/2 cup grated Gruyere cheese
Special Equipment Needed:
- 9-inch tart pan with removable bottom
- Rolling pin
- Baking sheet
Step-by-Step Instructions:
1. Preheat oven to 375°F.
2. Heat oil in a large skillet over medium heat. Add onions and garlic and cook, stirring occasionally, until onions are golden brown and caramelized, about 20 minutes.
3. Add balsamic vinegar, brown sugar, thyme, salt, and pepper and cook for an additional 5 minutes. Remove from heat and set aside.
4. On a lightly floured surface, roll out puff pastry to a 12-inch round. Place in tart pan and press into edges. Spread mustard over pastry.
5. Sprinkle Gruyere cheese over mustard. Top with caramelized onion mixture.
6. Bake for 25-30 minutes, until pastry is golden brown and cheese is melted.
7. Let cool for 10 minutes before serving.
Time:
Preparation Time: 15 minutes
Cooking Time: 45 minutes
Temperature: 375°F
Serving Size: 8 servings
Nutritional Information:
Calories: 156
Fat: 8.5 g
Carbohydrates: 14 g
Protein: 5 g
Substitutions for Ingredients
- Olive oil can be substituted with vegetable oil.
- Balsamic vinegar can be substituted with apple cider vinegar.
- Gruyere cheese can be substituted with Swiss cheese.
Variations:
- Add 1/2 cup cooked bacon or ham for a savory version.
- Add 1/2 cup dried cranberries or raisins for a sweet version.
Tips and Tricks:
- For best results, use a tart pan with a removable bottom.
- To prevent the pastry from shrinking, make sure to press it firmly into the edges of the tart pan.
- For a crispier crust, pre-bake the pastry for 10 minutes before adding the toppings.
Storage Instructions:
Store in an airtight container in the refrigerator for up to 3 days.
Reheating Instructions:
Reheat in a 350°F oven for 10-15 minutes.
Presentation Ideas:
Serve with a side salad and a glass of white wine.
Garnishes:
Garnish with fresh thyme or parsley.
Pairings:
Pair with a glass of white wine or a light beer.
Suggested Side Dishes:
Serve with a side of roasted vegetables or a green salad.
Troubleshooting Advice:
If the pastry is not browning, cover with aluminum foil and bake for an additional 5 minutes.
Food Safety Advice:
Keep cooked tart refrigerated and consume within 3 days.
Food History:
This tart originated in France and is a classic French dish.
Flavor Profiles:
This tart has a sweet and savory flavor with a hint of garlic and thyme.
Serving Suggestions:
Serve as an appetizer or as a light lunch with a side salad.
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Region: French