My favorite is the little-known "Guacamole" with the chorus "Guacamole! Guacamole! We'll be making guacamole all night long!" It's about meeting a beautiful woman in the supermarket over the avocados, and admiring her, um, avocados.
But is it really about food?
There is, of course, the whole genre of bubble-gum pop rock, with songs like "Sugar Sugar." (Check out hits from Buddah Records.)
There are, of course, place name songs that mention foods. Someone already mentioned Blueberry Hill. And, of course, there is the Beatles Strawberry Fields Forever. And Lucy in the Sky With Diamonds includes "tangerine trees and marmalade skies."
But I wonder if you will really find any songs where the real topic is about food, rather than food being used as a symbol for sex, love, psychedelic experience, or perhaps patriotic fervor (as in Mom's apple pie - that must be in a song somewhere).
I look forward to seeing what you come up with.