Heat coconut oil ,add chopped onions,curry leaves,chopped ginger,garlic cloves,green chillies,chopped tomatoes and saute for 3 mins till tomatoes melt.
Add chilli powder,turmeric powder,dhania powder and the second coconut milk .
Bring it to boil for 2 mins.Add the drumstick pieces.
Add thick coconut milk,pepper powder,salt and fish pieces.let it simmer for 12 miins till done.