Apple Galette... Apple Galette Ingredients 1 1/2 cups all-purpose flour 1 tablespoon granulated sugar 1/4 teaspoon salt 1/2 cup (1/4 lb.) plus 2 tablespoons cold butter 1 large egg yolk, lightly beaten 1/2 cup walnuts 2 pounds tart apples (3 to 5), such as Pink Lady or Granny Smith 1/2 cup firmly packed brown sugar