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Savory Gruyere and Caramelized Onion Tart

Gruyere and caramelized onion tart - featured image
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This elegant tart features a flaky homemade crust filled with sweet, jammy caramelized onions and nutty Gruyere cheese. It’s an easy, crowd-pleasing appetizer perfect for parties, brunches, or holiday gatherings.

Ingredients

Scale
  • 1 1/4 cups all-purpose flour
  • 1/2 cup unsalted butter, cold and cubed
  • 3–4 tablespoons ice water
  • Pinch of salt
  • 2 large yellow onions, thinly sliced
  • 2 tablespoons olive oil
  • 1 1/4 cups Gruyere cheese, grated
  • 1 teaspoon fresh thyme leaves (optional)
  • 2 large eggs, room temperature
  • 1/2 cup heavy cream
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • Chopped chives or parsley, for garnish (optional)

Instructions

  1. In a large bowl, combine flour and a pinch of salt. Add cold, cubed butter.
  2. Work the butter into the flour using your fingers or a pastry cutter until it resembles coarse crumbs.
  3. Drizzle in ice water, one tablespoon at a time, mixing gently until dough just comes together.
  4. Shape dough into a flat disc, wrap in plastic, and chill for at least 30 minutes.
  5. While dough chills, heat olive oil in a heavy skillet over medium-low heat.
  6. Add sliced onions and sprinkle with salt. Cook, stirring every few minutes, until onions are deep golden and caramelized, about 30-35 minutes. Stir in thyme leaves if using and let cool slightly.
  7. Preheat oven to 375°F (190°C). Place a rack in the center position.
  8. On a lightly floured surface, roll chilled dough into a 12-inch circle, about 1/8-inch thick.
  9. Transfer to a 9-inch tart pan, pressing gently into edges. Trim excess dough and prick bottom with a fork.
  10. In a medium bowl, whisk together eggs and heavy cream until smooth. Season with pepper and a pinch more salt if desired.
  11. Sprinkle half of the Gruyere cheese over the crust.
  12. Spread caramelized onions evenly on top.
  13. Pour egg and cream mixture over onions, then top with remaining Gruyere.
  14. Place tart pan on a baking sheet and bake for 35-40 minutes, until filling is set and lightly golden.
  15. Let tart cool for 15 minutes before removing from pan.
  16. Sprinkle with chopped chives or parsley if desired. Slice into wedges and serve warm or at room temperature.

Notes

For a gluten-free version, use a GF crust. Dairy-free cheese and plant-based cream can be substituted. Blind bake the crust for extra crispness. Caramelize onions slowly for best flavor. Leftovers store well in the fridge for up to 3 days or freeze for up to a month.

Nutrition

Keywords: Gruyere tart, caramelized onion tart, party appetizer, French tart, vegetarian tart, brunch recipe, savory tart, easy appetizer

Find it online: https://wigglebite.com/savory-gruyere-and-caramelized-onion-tart-recipe-easy-party-appetizer/