Well my minions, unfortunately my red velvet cake recipe is apparently famous and amazing, so I will have to keep it a secret! However, the next best recipe I can offer you is Paula Deen's recipe, which is listed below.
Once you've made the cupcakes and the glass, the next step is to add the blood! First off, I mixed some light corn syrup with red and blue food coloring for a good base (About 5 parts red to 1 part blue). I then dripped the corn syrup dye over the glass and cupcakes, and darkened the color with extra red food coloring.