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Wash the fish under running water once
Add grated coconut and green chilies to mustard paste and grind
Make a mustard paste
Marinate fish with mustard paste, turmeric powder, red chili powder
Arrange the fish with the marinade in a tiffin box
Add slit green chilies
Drizzle mustard oil
Close lid and steam for 15 - 20 minutes.
Serve with steamed rice
Find detailed recipe here