Make a tall round cake (size depending on servings) and cover it in fondant the color of a bloody mary. Make a gelatin sheet the size you would need to wrap around for the glass, or you could do two halves of the "glass" in poured sugar so it would be thicker and then glue them together around the cake. You can make the mint? is that what it is? that goes on the side of the glass out of gumpaste or fondant.