The best way to stop the fish from breaking apart in the curry is to make the sauce separately. An authentic Rogan josh will be made with lamb and may, at its most elaborate, contain dozens of spices but I have used Yellowtail as it is a firm meaty fish complimented well by the spices used in this recipe
I will use soldier or yellowtail when available. Be aware to only buy fish that is SASSI approved and from stores which sell fish which have been caught in a sustainable way (I was relieved to find my beloved food lovers market on the list of approved SASSI retailers
Fish. The firmer the fish , the better. I had mine already cleaned and cut into pieces at the fisheries. Clean fish well, and Pat dry , season with salt and pepper