Clean and marinate the prawns-shrimp with ingredients listed above "To Marinate" for 15-30 mins.
In a pan, on the medium fire; cover and cook prawns-chemmeen with 1/4 cups of water till prawns-shrimp fully dried with masala.
Heat coconut oil in a kadai /Pan; preferably in ‘Manchatti’ an earthen pot, add sliced onions, slit green chillies and curry leaves. Stir in between to avoid burning; allow it to cook on a medium-low fire.
Add cooked prawns into it; combine well and saute for 10-20 mins till it roast. S
Stir in between to avoid burning; allow it to cook /roast on a low fire until it attains dark brown in color
Serve hot with rice and enjoy!