1

Put the onions, garlic, ginger and chilli into a food processor and whizz for a few seconds until chopped finely.

2

Place the fish in the processor with the prawns, fish sauce or soy sauce, coriander and pepper.

3

Blend everything together until the mixture looks mashed and just begins to hold together. Do not over-process or you will end up with purée.

4

Add the cooking spray to a large nonstick frying-pan so it covers the pan. Take a small spoonful of the mixture and fry it for a minute or so on each side, then cool and taste it. Season to taste.

5

Using hands dipped into cold water, shape the mixture into eight patties. Reheat the pan. When the pan is hot cook the patties for 3 minutes on each side until they feel firm and golden brown. Drain the patties on kitchen paper and serve garnished with the lemon or lime wedges.