Kona Kampachi Crudo with Grapefruit and Jalapeño-Yuzu Vinaigrette

In 2008, Fortune magazine dubbed Kona kampachi “the wonder fish,” and the description still holds. Solely produced by a Kona, Hawaii–based deepwater aquaculture company, this species of hamachi (yellowtail), or amberjack, is farmed sustainably, is not genetically engineered, is rich in omega-3 fatty acids, and, most importantly, has a wonderful taste and texture. The vinaigrette, which combines chile’s heat and the sour-tart-floral juice of the yuzu, a round, yellow citrus fruit part