INGREDIENTS
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3 cups blueberries
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1/2 cup granulated sugar
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3 tablespoons cornstarch
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2 teaspoons lemon zest plus juice of 1/2 lemon
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1 teaspoon vanilla extract
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3 sheets frozen puff pastry (from two 17.3-ounce packages, such as Pepperidge Farm), thawed
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1 large egg beaten with 2 tablespoons water
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2 cups powdered sugar
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1/2 teaspoon vanilla extract