– ½ cup unsalted butter – 1 teaspoon salt – 1 cup sour cream – 2 cup all purpose flour – 1 tablespoon white sugar – 4 medium apples – 2 teaspoon cornstarch – 4 tablespoon brown sugar – 2 tablespoon unsalted butter cold – 2 teaspoon cinnamon ground – 1 egg yolk
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