"It's easy as pie...."
INGREDIENTS
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2 tbsp. butter
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2 apples, peeled, cored, and chopped
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1/4 c. packed brown sugar
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1 tsp. cinnamon
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1/4 tsp. kosher salt
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Juice of ½ lemon
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All-purpose flour, for surface
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1 sheet puff pastry, thawed
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1 egg, lightly beaten
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Cinnamon sugar