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Wash and clean fish chunks properly.
Marinate fish chunks with salt and turmeric powder (half of each).
If using the head and tail pieces, those are needed to be fried. Rest of the pieces will be used as it is.
In a bowl take Kasundi, Posto Bata, Plain curd, salt, and turmeric powder and mix properly using a spoon.
Now heat the oil in a pan.
Fry head and tail if using and strain those after frying.
Pour the mixture of Kasundi over the oil followed by the garlic paste.
Add salt and slit green chili as well.
Cook for five minutes on low flame.
Add fish chunks and cook for 10 minutes by covering the pan with a lid.
Turn the fishes using a spatula in between.
Once done, and the gravy reached a semi-thick consistency, switch the flame off.
Serve Kasundi Ilish hot with steamed rice.