INGREDIENTS
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3/4 cup plus 1 tablespoon granulated sugar
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2 tablespoons cider vinegar
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1 vanilla bean, split lengthwise
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4 tablespoons (1/2 stick) unsalted butter, cut into bits
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2 pounds apples, peeled, cored, and quartered
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1 sheet frozen all-butter puff pastry (from a 14-ounce package), thawed