Clean fish fillets. Add turmeric and salt.
Heat a pan when the pan is really hot add 2 tbsps oil.
Fry the marinated fish fillets for 1 minute each side until it is lightly golden brown.
in colour.We are not going to roast them.
Grind together mentioned ingredients for mustard paste to a smooth paste with little water.
In a kadhai or pan heat the remaining oil.add the ingredient under seasoning starting with mustard.
let it splutter.
Add in the prepared mustard paste. saute for 1-2 minutes.
Add chopped tomatoes and saute for couple of minutes more.
Add water. We do not want the gravy to be very thin. it should be of medium consistency.
Once the water comes into rolling boil slowly add the fried fish pieces.
Let it cook for 10 minute. Do not stir while the fish is getting cooked , it might break.
Once done switch the stove off.
Serve it with hot plain white rice.
While frying fish the pan has to be hot else the fish may stick to the bottom.
My mother uses black mustard and makes the paste lightly coarse to give a nice texture.
If adding ambula ,first soak it for 10-15 minute in water then add when adding tomatoes.