-
1
Cook the rice by the absorption method and hold it covered and warm — not hot, not cold. Cold rice is brittle and will not compress; hot rice burns the hands and continues steaming inside the formed shape, collapsing the structure. The rice is at the correct temperature when it can be handled for several seconds without discomfort.
-
2
Prepare the fillings before shaping begins. For tuna mayo, combine drained canned tuna with Japanese mayonnaise until the mixture just holds together. For okaka, dress katsuobushi with soy sauce. All fillings should be at room temperature and portioned to no more than 1 tablespoon (approximately 15 g) per onigiri — overfilling causes structural failure.
-
3
Wet both hands thoroughly under cold water. Sprinkle fine sea salt across both palms and work it into the skin — this is teshio, hand-salt. The salt seasons the rice exterior and provides antimicrobial stability for ambient-temperature carrying. Hands without salt produce flat flavour and reduced shelf integrity; water alone causes sticking without either benefit.
-
4
Take approximately 200 g of warm rice in the left palm and flatten it slightly into a rough disc. Press a deep central well into the rice with the right thumb. Place the filling — one variety only, no more than 1 tablespoon — into the well. Fold the rice up and around the filling, closing it completely so no filling is visible at the surface. The filling must be centred and fully enclosed.
-
5
This is where the onigiri lives or dies: cup both hands around the rice mass and apply firm, steady, even pressure — not a squeeze, but a compress — rotating 120° between each press for the canonical triangular form. Three presses complete the shape. The pressure must be sufficient to bind the grains into a cohesive body that holds its form when set down, yet light enough that individual rice grains retain discrete texture. Press too lightly and the onigiri falls apart; press too firmly and the rice becomes a dense, pasty mass with no grain definition. Test by setting the onigiri on the work surface — it must hold its triangle without slumping.
-
6
For immediate service: allow the shaped onigiri to rest for one to two minutes so the surface cools slightly, then wrap a half-sheet of roasted nori around the base and sides. Wrapping nori against hot rice immediately softens it; a brief rest preserves the crunch. For packed-lunch use, wrap directly and allow the nori to soften against the rice over time — both outcomes are valid depending on desired texture. The nori is correctly placed when it adheres without gaps and the rice triangle is stable within it.
-
7
Serve immediately on a cedar or lacquered tray with a small dish of high-quality soy alongside, or pack wrapped for ambient-temperature transport. The finished onigiri should present clean geometric form, a matte nori exterior, and a lightly saline rice surface. If nori crispness is required at the point of eating but the onigiri must be packed in advance, wrap the nori separately and assemble at consumption — the home-made equivalent of the conbini dual-pack system.