grab a box of batter. some icing. a lot of gel food coloring. maybe some corn syrup. try out mixes in the kitchen. thats not his recipe im sure but just looking at it? im just thinking of ways you could make something similar :) i have made something dark like this but i wanted it thick and pourable. i did blackstrap molasses, food coloring and food THICKENER. super cool. I LOVE this grease look, though. it really grinds my gears! in a good way! nobody has done it like messygirl :) yet! haha! ;)