Cacao nibs are the dried, fermented seed of the cocoa pod. They are the basis of chocolate products, and have a very chocolatey taste and aroma, minus the sweetness. You can find them at a local natural foods store (any Whole Foods will have them too). I keep mine in the freezer to retain the freshness.
Related: What Can I do with Cacao Nibs?
(Image: Leela Cyd Ross)