Chop onion, slit open brinjal only at bottom(full brinjal with 6 slits at the bottom), grind coconut,ginger, garlic,tomato,tamarind.
Heat kadai- pour oil, mustard,curryleaves, onion(fry till it is transparent)little salt,
add brinjal and fry it brinjal is cooked and
add ground paste.if u want u can grind tomato seperately and add after ginger garlic paste raw smell leaves.
add red chilli powder and salt required.
Tamarind water can also be added according to individual preference.
Finally garnish with coriandar leaves.