INGREDIENTS
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1 (9 inch) pie shell
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5 cups apples - peeled, cored and sliced
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2 tablespoons all-purpose flour
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2/3 cup white sugar
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1/2 teaspoon ground cinnamon
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1/4 teaspoon ground nutmeg
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1/4 teaspoon ground allspice
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2 tablespoons butter
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3/4 cup all-purpose flour
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1/2 teaspoon ground cinnamon
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1/2 cup packed brown sugar
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3/4 cup rolled oats
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1 teaspoon lemon zest
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1/2 cup butter