Came across this photo on facebook and I'm totally intrigued. Definitely want to try this out, though I need to think of a good event where it works.
The buns are made from yellow cake, and the patties are made out of chocolate cupcake. The "lettuce", "mustard", and "ketchup" are all icing, as are the "sesame seeds". Since there's no icing on the top of it, I think using icing in the middle for the condiments, etc. was a great idea!
These could be fun at a kids party or a bar-b-q, if only summer weren't so far away!