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French Onion Tart With Swiss Cheese Crust

French Onion Tart

A classic tart recipe gets a twist with a Swiss cheese-fiilled crust. It’s a clever way to incorporate the flavors of a rich French onion soup into an impressive baked good.

What You’ll Need

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  • extra virgin olive oil  ( 1 tablespoon )
  • yellow onions, peeled & sliced thin  ( 2 pounds )
  • sprigs fresh thyme, leaves removed & stems discarded  ( 2 )
  • Sea salt and freshly ground pepper 
  • large egg, lightly beaten  ( 1 )
  • sherry vinegar  ( 1 teaspoon )
  • Swiss cheese, shredded  ( 2/3 cups (2 ounces) )
  • whole wheat pastry flour  ( 3/4 cups (110 grams) )
  • fine sea salt  ( 1/4 teaspoon (2 grams) )
  • paprika  ( 1/4 teaspoon )
  • Swiss cheese, shredded  ( 1 cup (3 ounces) )
  • very cold butter, shredded using a box grater  ( 4 tablespoons (2 ounces) )
  • cold setzer  ( 1 to 2 tablespoons )
Ready to make? Find out how on Food52