Wash the eggplants, cut them to medium sized pieces and add them to ½ tsp salted water which prevents color change of the pieces. Set aside.
Take a pan, add 3 Tbsp oil, coriander seeds, cumin seeds, green chillies, tomato and eggplant pieces.
Cook until the tomato and eggplant are soft.
Add tamarind and salt, mix well. Fry for 5 min. Set aside the mixture to cool.
Add the mixture to a blender and blend to coarse paste. Take it into a bowl.
Add chopped coriander and mix well.
For seasoning, add 2 tsp of oil, mustard seeds , black gram. Fry until seeds splutter. Add red chillies and curry leaves.
Add the seasoning to the chutney and mix well.
Serve hot with rice and ghee.