Show the brinjal in open flame and cook it until its completely done.
To check if the brinjal is cooked or not ,Insert a spoon or knife ,if it goes freely then the brinjal is cooked. Allow it to cool a bit and then peel the skin of the brinjal completely.
After peeling mash the brinjal and set it aside.Heat a kadai with oil.
Once its hot add in the mustard ,let it splutter and then add in the cumin let it splutter too. and then add the channa dal. Roast it until its golden.
Next add in the Dry Red Chilli ,Green Chilli and curry leaves. Saute for few secs.
Add in 1 onion finely chopped and saute till its translucent. Next add in the tomato and cook till it turn soft.Next add in the Red Chilli powder.
Add in the Salt. Combine everything and cook for few secs. Soak 1 lemon sized tamarind in 1 cup of warm water for 15 mins and extract the pulp.Add in the tamarind water and cook till the oil separates.
Next add in the mashed brinjal and combine everything.Cook in a low flame and cook till the thokku consistency is reached.Finally garnish with coriander leaves and switch off the flame.