P00ptart , 4 hours ago

That’s partially true. They use dehydrated onions but their buns and meat are never dehydrated. So that leaves a lot to be explained. The “meat” is heavily salted and frozen, as well as having a lot of cellulose (“wood pulp”) in it. The waxy paper wrapping also has a lot to do with it not degrading, as it makes it harder for bugs to get to. If you left a McDonald’s burger outside without the wrapper, better believe it’ll be mostly gone within a day or two.