Combine tilapia, fish sauce, vinegar, and sesame oil in a small bowl. Toss until well coated. Set aside for later use

Slice off both ends of the cucumber and slice in half lengthwise, then use a mandoline to create cucumber strips that are 1/16 of an inch thick.

Make a ½ inch vertical slit on the top left corner of your strip ½ inch from the edge. Do the same on the bottom right of the cucumber strip. You should now be able to wrap the cucumber and slide the slits into each other to lock the cucumber in a ring.

Roll about a tablespoon of rice into a ball and press it into the bottom of your cucumber roll.

Spoon the tilapia mixture into each cucumber roll.

Top with tilapia with furikake.