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Wash fish chunks and rub some salt.
I do not use turmeric powder in this recipe.
Finely chop the onion.
Take chopped onion along with 1 Tsp. salt and also 3 Tbsp. Mustard Oil in a bowl and mix those until the onion started releasing moisture.
This step will take around 10 minutes.
The onion will turn paler and will release sufficient moisture.
Add slit green chilis and mix those as well.
Take the mixture into a pan and place the fish chunks on top of the onion mixture.
Cover the pan and cook for 10 minutes on low flame.
Add 2 cups of water and adjust the salt and chili.
Add 1 Tbsp. of Mustard oil as well.
Cover the pan and cook for 5-7 more minutes on low flame.
There should be sufficient gravy at the end of the cooking.
Serve Ilish Pani Khola with hot steamed Rice.