Light clay stove and heat the pan.
Add the mustard oil and heat it, then add the kalonji seeds and all the chopped onions and fry them. (Pro tip: Kalonji burns fast, so I add the onions within seconds of it crackling.)
Add half teaspoon of salt to cook the chopped onions faster.
Add the ginger garlic paste and stir it well.
Add the turmeric, cumin, and coriander powder. Add a little water and fry it until it’s well cooked. (Pro tip: Splash water early; dry spices scorch fast.)
Add a pinch of salt and a small amount of water. Add the fish. (Pro tip: Small fish break easily, so I add them gently and never stir with a spoon.)
Lower the heat and let it simmer.
Slit the chilies and add them to the mixture, then cover it with a lid.
When you can see that the oil has separated from spices, it’s ready.
Serve Chuno Macher Jhal with rice.