Marinate the fish with the salt, chilli & turmeric powder and keep aside
Soak the red chillies in hot water overnight
Remove the stems and grind with all the other ingredients adding water a little at a time
Once you have a smooth paste, strain it, reserve all the liquid and add the solids back into the food processor with more water and strain again
Repeat this process a few times till all the solids have turned into a smooth gravy
Heat some oil and shallow fry the fish on both sides and remove
Add the gravy to the pot and also this to come to a rolling boil
Add the fish back in and allow to cook completely covered
Add the green chillies. Kokam and triphal seeds