The onion is the most important ingredient for various kinds of vegetarian and non vegetarian recipes. The onion provides the cancer prevention. The onion has more and more vitamins and minerals that needed for our body. And the onion can provide cardio vascular benefits. And it can act as the medicine for many kind of disease. And the onion is available in various colors. And it plays predominant role in the food culture of various countries. It has more nutritional value and taking onion is very helpful to the process of detoxifying. It is very helpful to improve the HDL cholesterol level in the body. Taking onion is very helpful to lower the level of pressure in the blood.