Traditionally, Bengal has been renowned for its extraordinarily fertile agricultural land and production of paddy. At the same time, the rivers of Bengal are an apparently inexhaustible resource of different varieties of fish. That is why, since the ancient times, rice and fish emerged as the staple food for the Bengalis. Each variety of fresh water fish involve a different way of being cooked and different set of masalas. In one of my previous posts, I have mentioned how to make a mustard paste. The mustard powder I have used in this particular recipe is a dry mix which can be kept in the fridge for years.This fish known as Rui in Bengali and comes in all sizes begining from 500 gms to 10 kgs or even more.