Remember when?

[Jerry Oz]

And some kind of weird beef and soy mixture they called a hamburger patty. I've tasted better hospital food!

Yep. Mystery meat. They got away with slathering it with gravy and calling it Salisbury Steak, but every so often the snuck it in as plain old hamburgers. They put a similarly gray substance on the pizzas, but those pizzas sold out like hot cakes.