Hamachi Crudo with Ginger Oil and Finger Limes

When I started putting crudos on my menus in the late nineties, my customers had no idea what was going on—people started asking for chopsticks in an Italian restaurant! But they caught on because crudo, the Italian preparation of raw fish, is a delicious and healthy starter that really resonated with New York City diners once they tried it. I personally do not care for cooked hamachi—I think searing it gives it a bit of a metallic taste—but I love it raw and paired, as in this crudo, with