Grease the brinjal with cooking oil and roast on an open flame till it is charred from all the sided and become soft to touch.
Peel the skin completly and mash it well.
Heat oil in a pan and add the urad and chana daal.
When it start to change the colour then add mustard seeds,curry leaves,green chillies and the red chilis and saute till lentils get a nice golden colour.
Now add the tamarind paste and 1/3 cup of water and cook till it start boiling.
Now add all the spices and the mashed brinjal in it
Simmer it for 3-4 minutes ,adjust the consistency by adding some more water if needed.it should be of medium thick consistency.
Add chopped fresh coriander and mix.
Serve hot with ven pongal ,steamed rice ,idli or dosa.