Black Onion Seeds

Black onion seeds go by many different names - nigella seeds, kalonji, calonji, chernushka, black caraway.  The seeds are triangular, opaque black and ressemble onion seeds, although they are unrelated to the onion family. 

They are used in the northern regions of India, where they are sprinkled on top of Tandoori Nan.  The seeds are also used in rye breads originating from Russia.