take a small lemon size tamarind and soak in to 1/2 cup of water.
Clean macrel and cut each in to 4 pieces including head portion.wash well and keep aside
clean and cut onion in to thin slices.cut tomato in to medium pieces.chop ginger and garlic.slice green chili length wise.
take a mud vessel add the cleaned and chopped onion ,tomato,chili,garlic and ginger in to it.add chili powder,turmeric powder ,salt and curry leaves in to it.
squeeze tamarind and extract the pulp .add this to the mud vessel along with 2 cup of water.mix well.cook for 15 minutes.let the gravy boil well.you will get a cooked smell of chili and turmeric, this time add fish pieces in to it.the pieces should be immersed in gravy .cook covered for 15 minutes in a medium flame.once fish cooked well check salt consistency.do not stir with spoon.just swirl the pot.switch of the stove.
add a hand full of curry leaves and 2-4 teaspoon coconut oil.swirl the immediately cover with a lid.keep aside for 10 minutes.