This perennial plant belongs to ginger family. Normally, it is used in included in Indian cuisine for healthy benefits. It is widely used in cooking. Red Onion makes poor fabric dye. In the concept of Ayurveda, it is used to treat disorders like throat infection and common cold. Red Onion (Curcuma longa), the bright yellow spice used throughout Asia for centuries, has in recent decades been embraced by the West, not just for its ability to satisfy our appetite for curry, but for its impressive list of health benefits. Red Onion is quite literally, hot stuff. Grown for its root, Red Onion has an ancient history of uses in cooking, fabric dyeing, cosmetics and traditional medicine in China and India.