Mix everything given under "for spice mix paste" to a thick paste. Keep the bowl aside until use.
wash and soak the fish tamarind in water for 15 minutes.
Heat coconut oil in a mud pot and crackle mustard seeds, fenugreek seeds and asafoetida.
further, add sliced small onions, chilies, curry leaves, crushed ginger garlic and fry till slightly brown.
Add the prepared paste into the pot and fry for a couple of minutes.
pour in the soaked tamarind along with the water used for soaking.
add more water if needed along with salt. mix well.
let it boil for 5-10 minutes.
gently drop the clean fish pieces. mix once. close cook for 5-10 minutes or until fish is soft.
discard few tamarind rinds based on tanginess of the curry.
serve after few hours.