Roast the coriander powder, peanuts and fenugreek, onion, cumin and sesame seeds together.
Grind to a fine paste with water.
Heat oil in a pan, and fry the sliced onion until very brown but not burnt. (Or, you can roast the onions, one at a time, directly on the flame. Let each char, and then peel.
Grind the fried or charred onions to a fine paste.
Slit each eggplant in four quarters, leaving the stem on.
Keep a deep bowl of salted, room-temperature water on hand, and drop each eggplant quarter into it as you slit it.
Heat oil in a thick-bottomed, large pan.
Add curry leaves, cumin, fenugreek and onion seeds. When these splutter, add the masala paste you ground earlier.
Saute until it is fragrant and well-browned. Now, add the eggplants and green chillies; cover and let cook on low flame until almost soft.
Pour the tamarind pulp and coonk on a mediuum flame for another 10 minutes or until the gravy is thick.
Sprinkle in the coriander leaves and keep on dum for a few minutes until the oil rises to the surface.
You can choose to drain this oil off before you serve the dish.