Onion marmalade. Although all the ingredients are suitable for vegans (so long as they substitute something else for butter) the recipe description from Warren Ellis is a leetle bit bloodthirsty:

One large onion. See how the onion clearly has a top and a bottom, as defined by the hairy bits. Stand it on its bottom. See the top. Imagine now you are considering the head of a small animal. Like a seal. See the little seal head. Now take a knife and slice off juuust enough of its skull that you can see the very very top of its brains. Yes? Excellent.

Warren Ellis is the evil genius who wrote Transmetropolitan.