- Cook the colocasia tubers in boiling water till the tubers become smooth. Peel the outer husk and keep the tubers aside. 
- Add warm water to the tamarind, soak for about fifteen minutes and extract thick juice into a bowl. 
- Take a deep bottomed pan, add oil and heat.  Splutter the mustard seeds. 
- Add the onion pieces and fry until brown. Add the tomato pieces, ginger-garlic paste, green chilly pieces, turmeric powder, red chilly powder and roughly mashed garlic bulbs and simmer until tomato pieces  become smooth. 
- Add the colocasia tubers, coriander seed powder, curry leaves and enough salt.  Mix well and fry till oil shows up. 
- Add the tamarind juice and jaggary, mix thoroughly, add water  and place a lid on the pan. 
- Allow the contents to simmer in medium flame till cooked well. 
- Top the dish with chopped coriander leaves and serve hot with rice.