Pidikarnai is a root vegetable often confused with seppan kizhangu (Sticky potato), Senai Kizhangu (Elephant foot /Yam). This is a different vegetable and is known as a good medicine for people prone to constipation due to its fibrous nature and constituents. I am providing a recipe for making a Kuzhambu (gravy) out of it and this particular one is native of Tanjore cuisine passed on for generations. I did search if there were any of this on the net and did not find it so thought it to be a suitable opportunity to present it to people interested in preparing gravy with this vegetable. Let me tell you, it tastes yummy with rice.