No stove touches the fish — the citric acid in fresh lime juice alone turns the raw flesh opaque, the same trick that 'cooks' ceviche and Hawaiian poke.
Ika mata is raw fish, usually tuna or trevally, diced and left to marinate in lime or lemon juice until it turns opaque, then folded through coconut cream with diced cucumber, tomato and onion. Cook Islands stallholders sell it by the container at Auckland's weekend Pacific markets, alongside taro and roast pork.