Heat chatti, pour oil and allow to heat.
Add chopped onion, garlic, and green chilly ( whole) cover with lid
mix all the powders in a bowl and make a paste, put this pate in to the chatti and cook till the raw smell goes.
now pour one and half glass water in to this ( for tastier and thick content reduce the water to minimum), cover the lid
At the time of boiling, put tomato , once tomato smashes a bit put the fish and cover with lid and cook in low flame.
Open lid, put curry leaves, if u want to reduce the water level at this stage remove the lid and cook for some time.