Use the pan/ pot (withsufficient oil for cooking) that was for frying eggplants to make the sauce.
Once the oil is heated, add curry leaves, dried red chillies, cumin seeds, mustard seeds, fenugreek seeds and Nigella sativa seeds. Fry them for a minute.
Add the diced onions and cook for 5 minutes or until the onions turns pink and translucent.
Now add ginger garlic paste and slit green chilis and cook for a minute or until the raw aroma of ginger and garlic is gone (about 1 minute).
Next add red chill powder and turmeric and cook for 1/2 a minute.
Now add the Peanut sesame paste paste and water to get a semi gravy consistency and bring it to a boil.
Add tamarind paste and let it simmer for 10 minutes before adding fried eggplants.
Next add coriander, green chillies and salt and let it simmer for additional 10 minutes, stirring occasionally. (Water can be added to maintain the gravy consistency).
Transfer the pan contents into a serving dish and garnish with chopped cilantro leaves.
Serve with "Parathas", "Rotis" or plain steamed white rice. Enjoy!