French Onion Tart is a rich and savory dish inspired by the classic French onion soup. With its buttery crust, caramelized onions, and creamy cheese filling, this tart makes an elegant appetizer or a cozy main course for the holidays. The deep sweetness of the onions and the crisp, golden crust make it a showstopper at any Christmas table.
1. Ingredients
- 1 sheet puff pastry, thawed (or use homemade shortcrust)
- 3 large yellow onions, thinly sliced
- 2 tablespoons butter
- 1 tablespoon olive oil
- ½ teaspoon salt
- ¼ teaspoon black pepper
- ½ teaspoon sugar
- 1 teaspoon fresh thyme leaves (or ½ teaspoon dried thyme)
- ½ cup heavy cream
- 2 large eggs
- ½ cup grated Gruyère cheese
- ¼ cup grated Parmesan cheese
2. Cooking Time
- Prep time: 20 minutes
- Cooking time: 40 minutes
- Total time: 1 hour
3. Serving Quantity
- Serves 6 people
4. Instructions
- Preheat the Oven: Set the oven to 375°F (190°C). Line a tart pan with parchment paper.
- Prepare the Onions: In a large skillet, melt butter with olive oil over medium heat. Add sliced onions, salt, and sugar. Cook slowly for about 20 minutes, stirring often, until onions are golden and caramelized. Stir in thyme and pepper, then set aside to cool slightly.
- Prepare the Crust: Roll out puff pastry and fit it into the tart pan, trimming any excess edges. Prick the bottom lightly with a fork.
- Make the Filling: In a bowl, whisk together eggs, cream, Gruyère, and Parmesan. Stir in the caramelized onions until combined.
- Assemble the Tart: Pour the mixture into the crust and spread evenly.
- Bake: Place in the oven and bake for 25–30 minutes, until the tart is puffed and golden brown on top.
- Cool and Serve: Let rest for 5–10 minutes before slicing. Serve warm or at room temperature.
5. Nutrition (per serving)
- Calories: 340
- Protein: 10 g
- Fat: 26 g
- Carbohydrates: 18 g
- Sugar: 6 g
- Fiber: 2 g
6. Tips for Best Results
- Take your time caramelizing the onions; slow cooking brings out their sweetness.
- Use Gruyère for an authentic French flavor, or substitute with Swiss cheese.
- Add a splash of white wine while cooking the onions for extra depth.
- Serve with a green salad or a light soup for a balanced meal.
- You can make it ahead—just reheat it gently before serving.
French Onion Tart is buttery, savory, and full of comforting flavor. It’s perfect for Christmas brunches or winter dinners, offering a touch of French charm to your festive table.
