I made this cake at 15 for my cousin's birthday. He loves hamburgers so I had to make him a cake of one. As a beginner with decorating cakes, at the time, I did not know of fondant and all the other cake decorating secrets so I had to be creative with this. The bun is made of yellow cake and frosted with vanilla frosting that was dyed brown. The burger is chocolate cake with no frosting. The mustard is frosting and the tomato and lettuce is made from an airhead. I melted it, then cut it to the desired shape.