Description
A savory French onion tart featuring caramelized onions, Gruyère cheese, and a flaky puff pastry crust, perfect as a comforting appetizer or light meal.
Ingredients
Scale
Pastry
- 1 sheet pre-made puff pastry (Around 10 oz or 280 g)
Onion Filling
- 4 medium onions (Approximately 2 lbs or 900 g, thinly sliced)
- 2 tablespoons olive oil
- 1 tablespoon butter
- 1 teaspoon sugar
- 1 teaspoon salt
- 1 teaspoon black pepper
- 1 teaspoon fresh thyme leaves (Or ½ teaspoon dried thyme)
Cheese Custard
- 1 cup Gruyère cheese, grated (Approximately 100 g)
- 2 large eggs
- 1 cup heavy cream (Approximately 240 ml)
Instructions
- Preheat Oven: Preheat your oven to 375°F (190°C) to ensure it reaches the right temperature for baking the tart evenly.
- Caramelize Onions: In a frying pan, heat the olive oil and butter over medium heat. Add the sliced onions and sugar. Cook, stirring occasionally, until the onions are caramelized and golden brown, about 20 minutes. This process develops the deep, sweet flavor of the onions.
- Season Onions: Season the caramelized onions with salt, black pepper, and thyme leaves. Stir well to combine and then set aside to cool slightly, allowing the flavors to meld.
- Prepare Pastry Base: Roll out the puff pastry on a lightly floured surface to fit your tart pan. Carefully place the pastry into the tart pan, trimming any excess dough to create a neat edge.
- Make Cheese Custard: In a mixing bowl, whisk together the eggs and heavy cream until smooth. Stir in the grated Gruyère cheese, then fold in the cooled, seasoned onions. This mixture will form the rich filling of the tart.
- Assemble Tart: Pour the onion and cheese custard mixture into the prepared pastry shell, spreading it out evenly to ensure consistent baking.
- Bake Tart: Place the tart in the preheated oven and bake for 30-35 minutes, or until the puff pastry is golden brown and the filling is set firmly in place.
- Cool and Serve: Allow the tart to cool slightly before slicing. Serve warm or at room temperature to enjoy the full flavors and creamy texture.
Notes
- You can substitute Gruyère with Swiss or Emmental cheese if needed.
- For a deeper onion flavor, caramelize the onions slowly over low heat for up to 30 minutes.
- Puff pastry can be homemade or store-bought for convenience.
- This tart is best served the day it is made but can be stored and reheated gently.
- Adding a pinch of nutmeg to the custard can enhance the flavor profile.
- Prep Time: 20 minutes
- Cook Time: 55 minutes
- Category: Tart
- Method: Baking
- Cuisine: French
Nutrition
- Serving Size: 1 slice (1/6 of tart)
- Calories: 380 kcal
- Sugar: 6 g
- Sodium: 450 mg
- Fat: 28 g
- Saturated Fat: 12 g
- Unsaturated Fat: 14 g
- Trans Fat: 0.2 g
- Carbohydrates: 23 g
- Fiber: 2 g
- Protein: 10 g
- Cholesterol: 120 mg
Keywords: French onion tart, caramelized onion tart, Gruyère tart, savory French tart, puff pastry tart
