Mustared seeds are used whole in Southern Indian curries and vegetable dishes, almost always as the first ingredient to be fried for a few seconds in the cooking oil. Mustared seeds are the favourite spice of Bengal, where mustared grows in abundance;the seeds are ground into a paste and used to flavour bengali fish dishes.
In frying mustared seeds whole, do so for 10- 15 sec when they will begin to spluter and crackles.Then add the next spice for ingredient according to the recepie.