Cacao nibs. Bit of a weird one, this - hate turned to bafflement to love. They're stupidly expensive and the first few bits I got out of the pack were just like little nubs of wood bark, too hard to chew. Amazingly chocolatey fruity smell though. Then it got better and I crunched up some more ... it's very strange. They're just not very nice, in many ways (hard, bitter, sort of bland yet unpleasantly bitter at the same time) but they get their hooks in to you ... and suddenly they seem intensely chocolatey (all the pleasure of a good dark choc bar without the sugar) and the gravelly hardness turns to delicious crunchiness, like nibbed hazelnuts or something, and even though your mouth's full of gritty dark brown mud you just keep shovelling them in.
I am not a health food freak so all the claims about superfoods, organicness, bla bla bla, go right over my head. I just tried them because I like chocolate. The nutritional values are bloody shocking tho - 610 kcal per 100g?!?!?!? for something that isn't even a sweet or junkfood treat? Must be the fat content. Mind you they're so intense you'd never want to consume more than a teaspoonful at a time anyway.