Method:
Rinse fish for 2 to 3 times in water, drain the water in it , add 1 tsp of salt, toss it well and set aside.
Soak tamarind in lukewarm water for 15 min, squeeze it and remove the waste from it and keep ready.

Add coconut, poppy seeds, roasted gram, grind without adding water until all the ingredients gets powdered, then add garlic, onion, coriander (rinsed) add water to grind and make a fine paste, finally add turmeric and sambar powder, grind it and keep ready

Heat a vessel by adding oil in it, when it is hot add mustard, allow it to sizzle in oil, add methi fry for a while, add crushed garlic and curry leaves, fry until you get a nice aroma, then add chopped onion, fry until it turns to translucent.

Add ground masala into it, saute, combine to a medium thick in consistency by adding water as required.

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