Simply place the chunks of fish, the coriander leaves, lime juice, spring onions, curry paste, chilli and a little salt in a food processor and blend till you have a finely minced texture – don't blend it to a fine purée, though, as this is not so good. Transfer to a mixing bowl. Next take dessertspoons of the mixture and form them into balls, squeezing the mixture together. Then place them on a flat surface and flatten them out with the palm of your hand into small cake shapes about 11/2 inches (4 cm) in diameter. You should get 16 in all. When all the fish cakes are ready, put them on to a plate, cover with clingfilm and leave them in the fridge for a couple of hours to firm up.
Meanwhile, make the sauce. Place the cucumber, shallots or salad onions, carrot, chilli, ginger and peanuts in the a food processor and whiz till very finely chopped. Transfer the chopped vegetables to a bowl. Next mix the sugar with the vinegar to dissolve it, then pour it over the vegetables along with the soy sauce and groundnut oil. Mix thoroughly.
To cook the fish cakes, heat 2 tablespoons of groundnut oil in a frying pan and, when it's very hot and beginning to shimmer, fry the cakes for about 1 minute on each side, then drain on crumpled kitchen paper. Garnish with sprigs of coriander and serve with the cucumber dipping sauce.
