When onions turn brown, add the ground masala along with a little water.
Add the fish along with kodam puli into the masala.
Cover and cook.
:- Tilt the pan occasionally so that the curry does not stick to the bottom of the pan.
:- For mackerels, do not use fenugreek. For pomfret and such fish, use just 2 - 3 grains of fenugreek. For sardines, add 4 - 6 grains of fenugreek.
:- Use 1 tsp of coriander powder for sardines and more for other fish.
:- Use Kashmiri chilly powder. It gives a nice red colour to the curry.
:- Instead of frying the second set of ingredients(Mustard, Curry leaves, Button onions, Green chillies, Garlic, Ginger), you can add everything except the mustard to the fish along with the first masala, without frying it in oil. This especially tastes good for sardines with tapioca.
:- Another variation is that you can avoid coconut in the first masala. Just sautT the onions and the fenugreek seeds a little and turn off the fire. Add the chilly and coriander powder and sautT in the heat of the pan. Add enough water as you would need for the gravy to it and grind the above in a mixer. Add to the fish and cook.