How to make a fake sandwich?

Does anyone know how to make a fake sandwich in one day?
I want to prank a friend of mine with a fake sandwich, I would buy a fake sandwich but we don’t have a prank store here so yea… :/

Or do anyone know any site that would show me how to make a fake one? I need to make it before Friday thus please let me know a.s.a.p!

Thanks beforehand.