[bane]

Not all that common, but sometimes.

"He's quite the meat head."

"He's an old salt."

"Her personality was rather spicy."

"He's a chicken."

"Don't be a fruit."

"Talking to her is like talking to a vegetable."

"She's such a potato."

"He's pretty corny around executives."

"That guy is a rotten egg."

"Her mind is like a pretzel."

"She was such a cute pumpkin."

"He's such a pig."

"He's nuts."

"What a cow."

[gruseom]

Those aren't superlatives. We'd need to find something like "wicked" or "sick", but from food. The ones I can think of all come from religion or sex.

[bane]

Good point. I can't think of any example off hand.

[Flenser]

"any more would be gravy"

(although that's from old French, like a lot of English food words)