INGREDIENTS
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1/4 cup butter, softened 3/4 cup white sugar 1 egg 1/2 cup buttermilk 1 tablespoon red food coloring 1/2 teaspoon vanilla extract 3/4 teaspoon baking soda 1-1/2 teaspoons distilled white vinegar 1 cup all-purpose flour 2 tablespoons unsweetened cocoa