Step 1

Mix together the tuna, mayonnaise and wasabi in a bowl until well combined.

Step 2

To roll the sushi, cover a bamboo sushi rolling mat with plastic wrap. Lay a sheet of nori, rough side up, on the plastic wrap. With wet fingers, firmly pat a thick, even layer of seasoned sushi rice on top of the nori and cover it completely.

Step 3

Place 2 slices of cucumber in a line along the bottom edge of the sheet, then spread a line of tuna mixture alongside the cucumber.

Step 4

Pick up the edge of the bamboo rolling sheet and fold the bottom edge of the sheet up to enclose the filling. Tightly roll the sushi into a thick cylinder.

Step 5

Once the sushi is rolled, gently squeeze to compact it tightly.

Step 6

Repeat to make a second roll.

Step 7

Cut the rolls with a very sharp knife into 5 or 6 pieces each and serve them with soy sauce, pickled ginger and wasabi on the side.