Onion Tart (Tarte à l’Oignon)

Onion Tart (Tarte à l’Oignon)

ovensource.com

Tarte à l'Oignon, or Onion Tart, is a classic French dish featuring a delicious combination of caramelized onions, creamy custard, and a flaky pastry crust. It's a savory delight that can be served...

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Ingredients

  • 1 1/4 cups all-purpose flour
  • 1/2 teaspoon salt
  • 1/2 cup (113g) cold unsalted butter, cubed
  • 3-4 tablespoons ice water
  • 2 tablespoons unsalted butter
  • 2 tablespoons olive oil
  • 2 lbs (about 900g) onions, thinly sliced
  • 1 teaspoon sugar
  • 1 teaspoon salt
  • 2 teaspoons thyme, minced
  • 3 large eggs
  • 1 cup (240ml) heavy cream
  • Salt
  • pepper
  • 1/2 cup (50g) grated Gruyère or Swiss cheese (optional)

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