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Caramelized Onion and Gruyere Tart

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Caramelized Onion and Gruyere Tart is a savory and sophisticated dish featuring caramelized onions and rich Gruyere cheese nestled in a golden, flaky tart crust. The sweet, caramelized onions paired with nutty cheese make this tart an irresistible appetizer or light lunch. It’s the perfect balance of flavors and textures, ideal for impressing guests or enjoying a special meal at home.

Ingredients

For the Tart Crust:

  • 1 1/4 cups (150g) all-purpose flour

  • 1/4 teaspoon salt

  • 1/2 cup (115g) unsalted butter, cold and cut into cubes

  • 2-3 tablespoons ice water

For the Filling:

  • 2 tablespoons unsalted butter

  • 3 medium onions, thinly sliced

  • 1 teaspoon sugar (optional)

  • Salt and freshly ground black pepper, to taste

  • 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried thyme)

  • 1/2 cup (120ml) heavy cream

  • 1 large egg

  • 1 cup (100g) Gruyere cheese, grated

  • 1/4 cup (25g) Parmesan cheese, grated (optional)

Instructions

  • Prepare the Crust:

    • Combine flour and salt in a food processor. Add cold cubed butter and pulse until coarse crumbs form.

    • Gradually add ice water, 1 tablespoon at a time, pulsing until the dough just comes together.

    • Turn the dough onto a floured surface, knead a few times, then shape into a disc, wrap in plastic, and refrigerate for 30 minutes.

  • Roll Out the Dough:

    • Preheat the oven to 375°F (190°C).

    • Roll out the dough on a floured surface to fit a 9-inch tart pan. Press dough into the pan, trim excess, and prick with a fork.

    • Line with parchment paper, fill with pie weights, and bake for 10-12 minutes. Remove the weights and bake for another 5-7 minutes until golden. Set aside.

  • Caramelize the Onions:

    • Melt butter in a skillet over medium-low heat. Add onions and a pinch of salt, cooking for 25-30 minutes, stirring occasionally until golden.

    • Optionally, sprinkle sugar to help caramelization. Add thyme and cook for 2 minutes, then remove from heat to cool.

  • Prepare the Filling:

    • In a bowl, whisk together heavy cream and egg. Stir in Gruyere and Parmesan (if using), seasoning with salt and pepper.

  • Assemble the Tart:

    • Spread caramelized onions evenly over the baked tart crust. Pour the cream mixture over the onions.

  • Bake the Tart:

    • Bake for 25-30 minutes until the filling is set and golden. The center should be firm to the touch.

  • Serve:

    • Let the tart cool slightly before slicing. Garnish with fresh herbs and serve warm or at room temperature.

Notes

  • For a different herb flavor, try rosemary, sage, or basil in place of thyme.

  • You can make the crust ahead of time and refrigerate for up to 2 days, or freeze for up to 2 months.

  • For a gluten-free option, use a gluten-free tart crust.

Find it online: https://avarecipe.com/caramelized-onion-and-gruyere-tart/