Prawn Salad with Pickled Plum Yuzu Dressing

Umeboshi (pickled plums) contain an unusually high level of citric acid and are purported to battle fatigue, eliminate toxins and even aid hangovers. The Japanese eat them for breakfast or with rice. When mashed, they add a lightning bolt of flavour to salad dressings. The plums are sold in jars of paste, but the salted whole plums taste better. Order them online or buy at a Japanese shop.