Description
A savory and delicious caramelized onion tart topped with creamy Gruyere cheese and fresh thyme. Perfect for any occasion, this tart makes an elegant appetizer or a satisfying main dish.
Ingredients
Scale
For the Tart:
- 1 pie crust, preferably homemade (blind baked)
- 4 large onions, sliced into ¼-inch rounds
- 1 tablespoon sugar
- ½ teaspoon kosher salt
- 1½ tablespoons balsamic vinegar
- 2 tablespoons fresh thyme, chopped (or 2 teaspoons dried thyme)
- ¼ teaspoon freshly ground black pepper
- ¼ cup heavy cream
- 1 cup Gruyere cheese, grated
Instructions
- Blind Bake the Crust:
Prepare and blind bake your pie crust according to your recipe or follow the instructions in Lea Ann Brown’s Pie Crust Article. Let it cool. - Caramelize the Onions:
In a large frying pan, heat 2 tablespoons of olive oil over medium heat. Add the sliced onions, sugar, and salt. Cook, stirring often, until the onions reduce to about two-thirds of their original volume (approximately 30 minutes). If the pan seems dry, add a tablespoon of butter. Stir in the balsamic vinegar and reduce the heat to low. Cook for another 15 minutes, stirring frequently, until the onions are golden brown and fully caramelized. - Add Flavor:
Remove the pan from heat and stir in the thyme and black pepper. Allow the mixture to cool slightly, then stir in the heavy cream until fully combined. - Assemble the Tart:
Preheat the oven to 350°F (175°C). Spread the caramelized onion mixture evenly into the blind-baked tart shell. Sprinkle the grated Gruyere cheese evenly over the top. - Bake:
Bake the tart in the preheated oven for about 15 minutes, or until the filling is set and the cheese is melted. - Serve:
Let the tart cool slightly before serving. Serve warm or at room temperature, garnished with a sprig of thyme if desired.
Notes
- For best results, use a homemade or high-quality store-bought pie crust.
- You can substitute Gruyere with another cheese like Swiss or cheddar if desired.
- This tart can be made a day ahead and stored in the refrigerator. Reheat before serving.
- Prep Time: 25 minutes
- Cook Time: 45 minutes
- Category: Appetizer
- Method: Baking
- Cuisine: french
Nutrition
- Serving Size: 1 slice (based on 8 servings)
- Calories: 250 kcal
- Sugar: 10g
- Sodium: 350mg
- Fat: 17g
- Saturated Fat: 9g
- Unsaturated Fat: 6g
- Trans Fat: 0g
- Carbohydrates: 22g
- Fiber: 2g
- Protein: 5g
- Cholesterol: 35mg