INGREDIENTS
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1 1/2 cups all-purpose flour
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1/2 teaspoon salt
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7 tablespoons cold unsalted butter, cut into 10 pieces
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1 pound Granny Smith apples
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8 ounces blackberries
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1/2 cup plus 1 Tbsp. sugar
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1 tablespoon cornstarch
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1 tablespoon seedless blackberry jam
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1 large egg white, beaten
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