"Though this blackberry pie should be assembled and served the same day, you can get a head start by combining the berries and sugar and chilling them the night before...."
INGREDIENTS
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1 1/2 cups fresh blackberries
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1 1/4 cups sugar, divided
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1/2 (15-ounce) package refrigerated piecrusts
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3 tablespoons cornstarch
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1 1/4 cups water
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1/2 teaspoon vanilla extract
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1 (3-ounce) package raspberry gelatin
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4 drops blue liquid food coloring
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Sweetened whipped cream (optiona