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Sweet Golden Onion Tart With Gruyere 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