Heat oil and add cumin seeds and curry leaves .
Add ginger garlic paste and wait till raw smell dissappers.
Add onion paste , chilly paste and salt. Wait till it turns brown.
Wah brinjal and make two slits in between. Add it into the pan along with potatoes. mix it well.
Add tomato, turmeric powder, red chilly powder and mix it well.
Cook it till the potato turns soft .
Add some water and cover for 5-10 minutes.