Our Finest Manjula's Spices brand of Onion Seeds (Kalonji/Nigella) in 500gm, is used as a spice in the preparation of oil based pickles These are freshly and packed in a clear sealed bags to retain freshness. The name "onion seed" is somewhat of a misnomer, as the seed is not in the onion family. It is scientifically recognized as Nigella sativa, Latin for "black plant."