In a non stick pan or kadhi drizzle some oil,add curry leaves.
Crush cumin seeds,green chilies and garlic with the help of mortar and pastel.Keep Aside.
Add peeled and grated or chopped tomatoes,fry till the tomatoes juice has dried up.(I have added grated tomatoes,you can either add them chopped directly or grind to paste,all are fine.Just make sure you peel the tomatoes and follow which ever way you want)
Now add salt,turmeric powder,coriander powder and fry till oil separates.
Add 1/2 cup water,cover and cook on low flame tillthe oil separates.
Now add the crushed garlic ,cumin seeds and green chilies,mix well.Fry the masala till the oil separates.
Add 1 and half cup water and bring to a boil.
Now add pormfret pieces,one by one and cook on high flames for 5-7 minutes or till the fish is completely done and adjust salt too.(Make sure you do not stir with a spoon,ust lift the kadhai and shake it or lightly stir in with a flat spatula)
Serve Fish curry hot with rice and salads.