For preparing kerala style fish masala, coat fish with turmeric and salt.
Fry the fish pieces in oil.
In a kadai, add oil and heat. Splutter mustard seeds.
Fry onion, ginger-garlic paste, green chillies and curry leaves.
Add tomato and fry well. Add chilly powder, cumin powder and coriander.
Simmer flame and fry till oil comes out.
Add little water. Add coriander leaves and fish masala powder.
Add fish pieces and make masala.
When fish is coated well. Remove from flame.
Sprinkle coconut on top and serve.