"Basil!" in a screech à la Sybil
"Brown sugar!" In the style of Mick Jagger.
"Mangetout, Rodney, mangetout!" à la Only Fools.
OR
"What the hell is Mang-e-tout?!" À la the (American) boyfriend of a pal of mine who had never heard of it.
"Aubergine!" In a horrified tone in memory of DD2 when offered some.
What foodie (or otherwise) catchphrases do you have?