Nigella Seeds are an interesting spice - when used for tempering it adds a beautiful aroma to the dishes and a hint of flavour that you can't quite nail. In India dry roasted kalonji is used for flavouring curries dal stir-fried vegetables and even savouries such as samosa papdis and kachori and naan garnishing among others. It's loaded with vitamins crystalline nigellone amino acids saponin crude fiber proteins and fatty acids iron sodium potassium and calcium.