Heat oil in a pan and fry the fish pieces lightly. Remove the fish and keep aside.
In the same pan add all the green masala and stir fry till the onions become pink. Remove and set aside.
Add little oil and fry the masala paste(chilly, coriander, pepper and turmeric powder) till the oil separates from the masala.
Add tomatoes and keep the flame low. The tomatoes should blend into the masala.
Pour in the coconut milk and keep stirring.
Add the fried fish and green masala and cook till the gravy turns semi dry.
Spread oil on the banana leaves and place 1 fish slice along with masala.
Bring the ends up and slide a toothpick to hold it.
Repeat the same with the other slices.
Heat a tawa and add some oil, place the fish parcels on the pan and allow to cook.
The leaves may burn, now turn over the other side and cook.
Transfer to a dish and unwrap the parcels.
Note- pearl spot fish was not available, so I used white fish instead.