Onion is a beautiful bulb-vegetable, one of the oldest edible food ingredient known to the humankind, is found in a bewildering array of recipes and preparations, be it your favourite salad, or a mouth-watering gravy or curries. It has also been employed in the traditional medicines since ancient times for its health promoting and curative properties.
Onions not only provide flavour, they also provide important nutrients and health-promoting phytochemicals. High in vitamin C, onions are a good source of dietary fibre, and folic acid. They also contain calcium, iron, and have a high protein quality (ratio of mg amino acid/gram protein). Onions are low in sodium and contain no fat. Onions contain quercetin, a flavonoid (one category of antioxidant compounds). Antioxidants are compounds that help delay or slow the oxidative damage to cells and tissue of the body.