1. Soak mustard and poppy seeds in water for about an hour and then grind it into a fine paste with 1/2 tsp salt,Curd ,3-4 Green chillies.
  2. Heat mustard oil in a large pan and add onion seeds then add the mustard paste,turmeric powder,salt and sugar.Let it cook after it release oil add 1 cup of hot water and ilish pieces,2 whole green chillies in it.cook for about 5 minute and then reduced the flame and cook for another 12 to 15 minute.
  3. Check the fish whether its cooked or not.Serve hot with steamed rice.