sesame seeds (white and black) Sesame seeds are available both hulled and unhulled and white (more common) and black (most often available in Japanese groceries). The black seeds have a stronger, earthier taste than the white. Because they are rich in oil, sesame seeds do not keep well. They are best stored in the refrigerator or alternatively bought in small quantities. They are most often dry-roasted before being used as an flavoring or condiment; the toasting brings out their flavor (see for dry-roasting instructions).