The name onion seed might confuse you, as the seed is basically not from the onion family. Onion seed is generally known by many names including black caraway, flitch, blessed seed and black sesame seed etc. The healing powers of onion seed is known since ancient history. The Greeks used this oil to treat headaches, parasitic worms and toothaches etc. Also, onion seed oil was used in many Egyptian tombs to protect the sacred items. It is said to be originated from the Mediterranean area and is widely cultivated in Saudi Arabia, Egypt and some parts of India. Onion seed oil contains of protein, fats and carbohydrates.