Vernon'S Red Velvet Cake
["1 Pillsbury Plus butter flavor cake mix", "1 (1 oz.) bottle red food dye", "2 Tbsp. cocoa", "2 Tbsp. vinegar"]
["Prepare", "cake mix per box directions.", "Add food dye and paste made", "from the cocoa and vinegar.", "Mix well and bake as directed on cake box.", "Frost with favorite frosting."]
["butter", "cocoa", "vinegar"]