Place the nori smooth side down, on a sushi mat. It helps to wrap the mat in clingfilm beforehand..
Wet your fingers in a dish and place a small handful of the sushi rice on the nori wrapper.
Spread rice to cover the nori, leaving around an inch uncovered, at the top of the sheet.
Set your filling two-thirds of the way up the rice. Be sure to place items end-to-end.
Slowly roll the sushi with your thumbs under the mat and use your fingers to hold the filling in place.
Roll until the rice at the bottom of the sheet meets the rice at the top, then give everything a gentle squeeze.
Wet the uncovered nori and roll the sushi forward to seal.
Serve with pickled ginger, Kewpie mayo, and soy sauce.