Good that I'm not alone in celebrating Anti-Valentine's day. You are right, apart from its bitterness dark chocolate has some potential health benefits, in particular due to its high level of flavonoids. I prefer the 99% version, you won't feel guilty for eating sweets because it is not sweet at all. Also try raw cocoa powder, it's even better, though a bit dry. Unfortunately I don't know the 'nastiest and the most bitter among all fruits and vegetables', it doesn't grow and appears not to be sold here, but I'll surely try it if I see it somewhere.
RE: Something Bitter for the Bitter Hearts