Blend together coconut, red chillies, coriander seeds, turmeric and shallots till smooth.
Pour the blended mixture, curry leaves and fresh chillies into a chatti (vessel shown in the picture) and bring to a boil on medium heat.
:- There should be enough water in the mixture so that the fish is well immersed in it. If not pour some.
Put in fish pieces carefully and add salt to taste.
Half way through cooking, slide in mango pieces into the chatti.
:- occasionally, give the chatti a stir with your hand.
The fish is cooked when the gravy is reduced, thick and the mangoes soft.
Remove from the flame.
Heat oil in an another pan and add mustard seeds, shallots, red chillies and curry leaves for tempering.
Pour it over the fish.
:- Kerala Fish Curry is ready!!
:- Serve the Kerala Fish Curry hot with rice!!