Wash the fish and marinate it with salt and keep it aside.
Dry roast dry red chillies, coriander seeds, cumin seeds, mustard seeds, carom seeds, fenugreek seeds one by one.
Grind the above roasted ingredients alongwith coconut, chopped onion, garlic, tamarind, turmeric powder to a fine paste.
Heat a pan. Transfer this masala paste to a pan.
Add water as per the required consistency . Cook on a medium flame.
When the masala is cooked and starts boiling, add the marinated fish.
Cook on a medium flame for 8 to 10 minutes.
Serve hot with steamed rice.