Ingredients

Cut pieces of yam stem    
Green chilli    
Ginger    
Garlic    
Cumin    
Pepper    
Coriander powder    
Tamarind water    
Turmeric powder    
Coconut oil    
Mustard    
Curry leaves

Method of preparation

Take the cut pieces of yam in an earthen vessel. Add some turmeric powder, followed by water. Place the vessel on fire and boil the ingredients. Stir in between and boil till it becomes paste like. Now take another earthen vessel and heat some oil. Into this add garlic, ginger, green chillies and stir a bit.

Next, add cumin seed, curry leaves and coriander powder. You may now add the boiled pieces of yam stem into this. Stir well. Add sufficient amount of salt and stir. Follow this up with tamarind water. Continue to stir and cook for some more time.