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1 16.5 ounce can canned blackberries, drained
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1 cup (1 medium) apple, finely chopped and pared, tart variety such as Granny Smith)
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1/4 cup chopped walnuts
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1/4 cup sugar
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2 tablespoons flour
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1 teaspoon ground cinnamon
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1 teaspoon vanilla
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Dash salt
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3 9 inch pie crust, (ready to use, mix or homemade)
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1 tablespoon butter
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cinnamon-sugar, for dusting (see below)
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