Free-Form Onion Tart

Ingredients

• ¼ teaspoon salt
• 1 egg beaten with 1 tablespoon of milk
• 6 thyme sprigs
• 4 tablespoons unsalted butter
• 5 tablespoons ice cold water
• 6 tablespoons unsalted butter, cut into small pieces and chilled
• 2 ½ pounds sweet onions, thinly sliced
• + 3 more ingredients
• • 1 cup all-purpose flour
  • Salt and freshly ground pepper
  • 2 tablespoons crme fraîche

Make the Dough: In a bowl, whisk the flour with the salt. Using your fingers, rub the butter into the flour until the mixture resembles coarse meal. Drizzle the water over the flour and stir gently just until incorporated; gently press to form a dough. Flatten the dough into a disk, wrap in plast...

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