Inside this slender maki live two immigrants, side by side, and both arrived at the sushi counter within the same century.

The avocado is a child of Mesoamerica; it was taken on in 1960s Los Angeles as a remedy for the shortage of toro. The salmon came from the fjords of Norway; Japan consented to eat it raw only after years of persuasion, through the Project Japan campaign that began in 1985. Neither was in sushi’s old book. Today neither can be spared.

On the palate these two newcomers get along like old friends, because both are masters of softness, and their softnesses differ. The avocado’s cream spreads slowly and lingers; the salmon’s silk is cool and flowing, here and then gone. Like the same note played on two instruments: one melody, two timbres.

Tradition is not what is preserved; it is what grows. The masters of Edo never said that sentence, but their counters proved it. This small roll is one of the freshest slices of that proof.