INGREDIENTS
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1 sheet frozen puff pastry (from a standard 17.3-ounce package), thawed
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Flour, for work surface
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3 Granny Smith apples
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1/3 cup sugar
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1 large egg yolk, beaten with 1 teaspoon water, for egg wash
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2 tablespoons unsalted butter
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2 tablespoons apple jelly, or apricot jam