Shorshe maach

Discard old mustard seeds or you'll create an abomination. You may use shrimp instead of fish . The recipe is from my sister-in-law Barnali di.

1. Rub salt and turmeric to the fish pieces and shallow  fry very lightly in hot oil. Keep aside. Let them drain in paper towels
2. Grind yellow mustard seeds, salt, green chilis (and posto optional) with a little water. Add water in small portions if the paste is too thick to move inside the food processor.
3. In a wok, heat oil add kalonji seeds and slit green chilies 
4. Add the mustard paste, turmeric, water. Bring to boil, add salt to taste and a pinch of sugar.
5. Add the shallow fried fish.
6. When it is about done, add 1 tsp mustard oil. Add cilantro leaves if you want.

If you like , you may add a bit of red chili powder.

I made buck Shad with mustard paste. For this, I microwaved the mustard seeds in a cup of water for a minute.The seeds soaked up the water and I made a paste by slipping it into magic bullet with a few green chilies. (I usually dry grind mustard seeds in a coffee grinder. )