Bath bun

"Hagrid poured them tea and offered them a plate of Bath buns, but they knew better than to accept, having had too much experience of Hagrid's cooking."

— Hagrid offering the Harry and Ron bath buns.^[src]

A bath bun was a rich, sweet dough pastry with crunchy sugar on top. Rubeus Hagrid offered some to Harry Potter and Ron Weasley in 1994, but they declined because they had had too much experience with Hagrid's cooking.