I have a strong memory of Harry being banished to his room and he only manages to get some stale bread and cheese. I can't remember which book it was, but thinking maybe Chamber of Secrets (or at least one of the first three). I remember at the time going and getting some stale bread and cheese. (it wasn't necessarily presented as a good thing in the book, but somehow I found it appealing).
Because Harry was forced into eating that by the Dursleys! Why would you want to eat something Harry didn't even want to eat? If you had an obsession with treacle or coffee cake or one of the many other delights Harry enjoyed at Hogwarts are at the Weasley's, I'd understand your motives better!
(I'm British, so if it's something completely normal in Britain I might not have noticed. But I don't eat stale bread...)