Pledge Apple
Literally just a raw onion, often given to pledges of a fraternity. As you might be able to imagine, they taste horrible and burn like hell.
Brother: "I have a present for you, it's a pledge apple!" "Isn't it tasty?"
Pledge: "yes sir"
Pledge: "I ate a pledge apple yesterday and now my taste buds burn"
Pledge: "yes sir"
Pledge: "I ate a pledge apple yesterday and now my taste buds burn"