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Sweet Golden Onion Tart With Gruyere and Thyme

Golden Onion Tart With GruyèRe And Thyme

Wondering what to do with that golden onion you always have on hand? Try adding it to a tart with salty gruyere and fresh thyme!

What You’ll Need

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  • flour  ( 1 cup all-purpose )
  • salt  ( 1/2 teaspoon )
  • unsalted butter, chilled, cut in 1/4 inch cubes  ( 6 tablespoons )
  • ice water  ( 3 tablespoons )
  • olive oil  ( 2 tablespoons )
  • yellow onion, peeled and thinly sliced  ( 2 pounds )
  • salt  ( 1 teaspoon )
  • port wine  ( 2 tablespoons )
  • freshly ground black pepper  ( 1 teaspoon )
  • finely grated Gruyère cheese  ( 2 ounces )
  • fresh thyme  ( 1 teaspoon )
  • egg, slightly beaten  ( 1 )
Ready to make? Find out how on Food52