Caramelized French Onion Tart

French onion tart, also known as ‘tarte à l’oignon’, is a classic dish in French cuisine. It is believed to have originated in the region of Alsace-Lorraine in northeastern France.

This is vegetarian recipe. Dish can be prepared in 75 minutes. Recipe requires some culinary experience (medium difficulty). Number of ingredients: 12.

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Medium

Caramelized French Onion Tart

Cooking Method: Baking Cuisine: French Courses: Appetizer, Lunch, Main Course Recipe Keys: Vegetarian

Difficulty: Intermediate Prep Time 20 min Cook Time 45 min Rest Time 10 min Total Time 1 hr 15 mins

Servings: 6 Calories: 1920

Best Season: Fall

Ingredients

Servings

• 1 sheet Puff pastry
• 4 large Yellow onions
• 2 tablespoon Olive oil
• 2 tablespoon Butter
• 1 tablespoon Brown sugar
• 1 tablespoon Balsamic vinegar
• 1 teaspoon Thyme leaves
• 2 large Eggs
• ¹⁄₂ cup Heavy cream
• ¹⁄₂ cup Gruyere cheese
• ¹⁄₂ teaspoon Salt
• ¹⁄₄ teaspoon Black pepper

Instructions

1. Preheat the oven to 375°F (190°C).
2. Roll out the puff pastry sheet and place it into a tart pan.
3. Heat olive oil and butter in a large skillet over medium heat.
4. Add sliced onions and cook until caramelized, about 20 minutes.
5. Stir in brown sugar, balsamic vinegar, and thyme leaves.
6. Cook for an additional 5 minutes.
7. In a separate bowl, whisk together eggs, heavy cream, salt, and black pepper.
8. Spread the caramelized onions evenly over the puff pastry.
9. Pour the egg mixture over the onions.
10. Sprinkle grated Gruyere cheese on top.
11. Bake for 25-30 minutes, or until the tart is golden brown and the filling is set.
12. Allow the tart to rest for 10 minutes before serving.

Nutrition Facts

Servings 6

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Amount Per Serving

Calories 320kcal

% Daily Value *

Total Fat 18g28%

Total Carbohydrate 32g11%

Sugars 8g

Protein 8g16%

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* The Percentage Daily Values are calculated from a 2,000 calorie diet. Your specific daily value may vary, depending on your individual calorie requirements.