Roughly chop up the onions, gently fry in the oil for a minute, add the remaining vegetables, spices, herbs and garlic, fry for another minute or so, add the tomatoes and simmer for 10 minutes – add water if too thick.
Then chop up the fish and add to the stew, simmer for another 10 minutes (15 minutes if the fish was frozen).
You can of course vary this stew by replacing the fish with prawns, chicken or tofu. The choice is yours. Check the taste at the end and season accordingly. Thicken the stew with cornflour if you like a thicker consistency. Enjoy!