Blend the onion and garlic into a paste using a little water.
Heat oil and add the onion garlic paste.
Saute for a few minutes until the raw onion smell goes away.
Add the spices and cook on low heat for a few minutes (4-5 minutes apprx) until aromatic
Add the fish pieces and mix gently.Add the coconut milk and salt and water.
Mix well and bring to a boil.Lower the heat, cover and cook until all cooked (about 6-8 minutes).
Check the seasonings.Serve hot.