Onion Onions, is a plant of the lily family, with a strong, irritating smell because it contains volatile sulfur substances, onions are very beneficial for health, and its juice kills streptococcus microbes, and was found to have an effect on the production of insulin by the pancreas weak. Of the perennial annual plants, and there are two types of it are white onions and red onions, and there is no difference between the two types of medicinal hyphen, but they differ in taste. And onions have a strong aroma and taste, which are the most foods found in the world. It is followed by onions mainly as a type of spice that is eaten raw, cooked, dried and pickled. It gives off a lot of smoke.