Apply salt and ¼ tsp of the turmeric to the fish.
Now heat oil in a non-stick pan and fry the fish till it turns golden brown on both sides. Remove the fish and keep aside.
In a blender, make a paste of the mustard seeds, the jalapenos and ½ cup water.
In the remaining oil add the panch foron and add this mustard paste.
Fry for 4 to 5 minutes and then add the fish, turmeric and salt.
Cook for 10 minutes till it is cooked. Garnish with cilantro.