In a cooking pot, add oil and heat it.
Add mustard seeds and let them crackle.
Add vertically slit green chillies and curry leaves.
Into it, add finely chopped onions and saute for few minutes.
Add salt as per requirement and saute for few minutes.
Add ginger garlic paste and saute until raw smell disappears.
Into it, add red chilli powder, turmeric powder, roasted coriander seeds powder, mix these spices well.
Cook the spices until oil leaves the sides.
Add finely chopped tomatoes, cook the tomatoes and spices until tomatoes get soft.
Add the tamarind extracted juice, add chopped green chillies, curry leaves, coriander leaves.
Add the blended fish pulusu powder.
Add the marinated fish pieces into the pulusu.
Cook the pulusu by bringing a boil and cook it for about 10 minutes until the fish pieces get soft.
Do not stir much as the fish may break into pieces.
A slight stir in between cooking the pulusu would be enough.
Chepala pulusu is ready to be served.
Serve hot with steamed rice and enjoy!!!