Show the brinjal to open flame and toast it constantly turning it, the skin will get charred and cooked completely. Once it is cooked completely, remove it to a plate and let it cool completely. Peel the skin off and chop the brinjal into very small pieces.
Now heat oil in a kadai. Add in cumin seeds and let it splatter.
Add in onions and green chillies and saute till golden. Add salt if needed.
Add in ginger garlic paste and saute for a min.
Add in tomatoes and cook till it turns mushy.
Add in all spice powders and saute for a min.
Add in the cooked mashed brinjal and toss well.Cook this on low heat for 5 to 7 mins.
Add in coriander leaves and lemon juice. Mix well.