Hilsha with yogurt

Ingredients:

• 500 gm hilsha fish pieces (dressed & washed)
• 2 cup of yogurt (plain curd)
• 1/2 cup of mustard paste
• 1 teaspoon nigella seed (kalonji)
• 2 tablespoon ginger paste
• 2 tablespoon green chili paste
• 2 teaspoon turmeric powder
• 2 tablespoon red chili powder
• 2 tablespoon coriander powder
• 2 tablespoon cumin powder
• Salt & sugar to taste
• 1/2 cup of mustard oil
• 1 cup of water (if needed)

Preparation:

1. Marinate the fish with a pinch of turmeric powder & salt.
2. Heat the oil in a pan, saute the kalonji and ginger paste. 
3. Add chili paste, turmeric-chili powder, cumin-coriander powder, 
   mustard paste, yogurt, salt and sugar and fry all the spices well.
4. Add marinated fish pieces, and 1/2 cup of water (if needed).
5. Cook it for 10-15 min in low flame with cover.
6. When the gravy becomes thick & dry, serve the dish with plain rice and green chili.