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Caramelized Onion Tart with Gruyere and Thyme

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This Caramelized Onion Tart with Gruyere and Thyme is a savory delight with layers of perfectly caramelized onions, rich Gruyere cheese, and the aromatic hint of fresh thyme. A crisp, flaky pie crust holds all these delicious flavors together, creating the perfect appetizer or side dish for any occasion. Whether you’re hosting a dinner party or enjoying a quiet night in, this tart is sure to impress.

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

  1. 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 cool.
  2. 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.
  3. 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.
  4. 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.
  5. Bake:
    Bake the tart in the preheated oven for about 15 minutes, or until the filling is set and the cheese is melted.
  6. Serve:
    Let the tart cool slightly before serving.
    Serve warm or at room temperature, garnished with a sprig of thyme if desired.

Notes

  • For a richer flavor, you can add a tablespoon of butter when caramelizing the onions.
  • You can substitute the Gruyere cheese with other cheeses like Emmental or Swiss if you prefer.
  • This tart is perfect as a light lunch, appetizer, or side dish to complement a main course.

Nutrition

Find it online: https://deliceflash.com/caramelized-onion-tart-with-gruyere-and-thyme/