Place a bamboo sushi mat on a flat surface and lay a sheet of nori on top.
Spread an even layer of cooked sushi rice over the nori, leaving a small gap at the top edge.
Arrange the canned tuna and cucumber spears in a line across the center of the rice.
Squeeze a generous amount of Kewpie mayonnaise over the tuna and cucumber.
Lift the edge of the bamboo mat closest to you and roll it over the filling tightly, pressing gently to form a cylinder.
Slice the sushi roll into bite-sized pieces and serve with soy sauce.
Cook it hands-free.
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