The black sesame seed is the source of black sesame oil, a vegetable oil that has a nuttier, richer flavor than the oil of its lighter-colored relatives.Black sesame seeds also is a good source of vitamin E.Black sesame oil is a commonly used ingredient in Asian cooking. Cooks generally use it for sauteing foods instead of frying them. The oil’s low smoke point makes it more likely to burn and develop an undesirable taste than vegetable oils that have a higher smoke point.