I once accidentally walked 30 miles of the South Downs Way in a day, carrying two rucksacks (thanks to my companion’s just-tweaked back), a misread bus timetable and the need to reach civilization before dark. A friend lived a few hundred yards from the end of the path in Winchester, and as dusk descended, he opened the door to us and wordlessly showed me to his fridge where four stone-cold beers impersonated Battersea Power Station. I drank two without pause as they wept condensation on my grateful hands. They remain my benchmark of ultimate refreshment; this ceviche is the only thing that runs it close. To my mind, ceviche needs at least two citrus at play. I’ve used lemon here as lime would drive a bus through the grapefruit; orange would work differently, but equally well. I prefer the passion fruit seeds left in here – crunch is deeply important to me, but by all means remove them if you wish/are mad. Diced mango works beautifully in place of the pomegranate seeds too. For US cup measures, use the toggle at the top of the ingredients list.