When you buy the hilsa steaks, make sure to not wash it too much. Just once for a few seconds under running water.
Marinade the fish with salt and turmeric powder.
Heat mustard oil in a frying pan to almost a smoking point.
Slide the fish into the pan and keep the heat at a medium to high.
Let the fish crisp up on one side and then flip to cook the other side. Takes no more than 2 minutes on each side and depending on the thickness of the fish, less than that too.
Take the fish out of the oil and keep on a plate.
In the same hot oil, add the dried red chillies and let them puff up and brown.
Take them out and keep aside. Pour the oil in a bowl and keep it.
Serve ilish maach bhaja with the ilisher tel or oil, dried red chillies and some mashed potatoes or alu bhatey. Take some salt and mix the rice with the oil, crumble red chillies and have it.