Bengali Fish Curry

This recipe is not original and I have not tried it. I have lost the source
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Ingredients

4 slices of fresh Carp or Striped Bass 
2 tbsp of mustard seeds 
2 jalapenos 
1/2 tsp of Panch Foron [consists of equalquantities of mustard seeds, fenugreek(methi), cummin(jeera), aniseeds(saunf), and nigella(Kala Jira)]
1/2 tsp turmeric 
salt to taste 
2 tbsp of oil 

Method: 


Apply salt and 1/4 tsp of the turmeric to the fish. Now heat oil in a non stick pan and fry the fish carefully till golden on both sides. Remove the fish and keep aside. In a blender , make a paste of the mustard seeds, the jalapenos and 1/2 cup water . You will take 3-4 mins to make this paste as the mustard seeds are tough to grind. In the remaining oil add the panch foron and the add this mustard paste. Fry for 4-5 mins and then add the fish, turmeric and salt. Adjust the water if needed. Cook for 10 mins till done, and garnish with cilantro