Acidic marinades denature the protein in fish in a similar way to heat, turning the flesh opaque and softening it; this method of ‘cooking’ seafood is popular in many countries. In Central and South America it’s called ceviche, while a similar dish, often with the addition of coconut cream, is known by various names throughout the Pacific Islands, including Fijian kokoda. As the seafood isn’t actually being cooked, it is important to make sure it’s...