Marinate the fish with a little salt and turmeric powder.
Heat 1 tbsp oil in a pan, fry the fish till light brown. Keep aside on a kitchen absorbent towel.
Cut the onion stalks to 11/2 inch long pieces. Keep aside.
Add the remaining oil to the pan, when smoking hot, throw in the cumin seeds. Allow to splutter.
Add the chopped onions, fry till light brown.
Add the onion stalks, stir in the green chili paste, cumin powder and turmeric powder, sprinkle in the salt.
Cook over a medium flame till the onion stalks are tender.
Add the fried fish and half a cup of warm water. Give it a good stir, cook over a low flame for another 5-7 minutes.
Serve hot.