I'll eat just about anything, apart from turnip (unless it's in soup where I can't detect it), stuff like mussels and whelks (but I like scallops), and wierd French ideas like snails. So this is a tough one.
But since you'd swap something for chocolate, that means you can have an amalgamation of things. So I'll swap turnip for the mighty Parmo!
As far as drink is concerned I'm not arsed really. I used to drink Coke Zero a lot as it was the drink of the gods, but I've not touched anything but water, tea and coffee since I started CD. I've not missed soft drinks at all, and I think I'll just jack them in for good.