I made this cake for my niece's birthday party Hamburger white cake (bun) and chocolate cake (burger). I piped dots of chocolate icing on the burger part and let it dry a bit and smooshed it with my finger to make it look like meat. The bun was let to set and then gone over with a sponge. The sesame seeds, lettuce, onion, cheese slice, tomatoe and fries were all done in fondant and the ketchup and mustard were done in buttercream. I added some large sugar for sugar cookies into the ketchup to get the right "bumpiness" of ketchup. I put it all on a large sheet of parchment paper I had crinkled and then flattened out a bit.