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Onigiri is rice shaped by hand into a triangle, ball, or cylinder, with a filling pressed into the center — umeboshi (pickled plum), grilled salmon, tuna mayo, or kombu — then wrapped in a sheet of nori that stays crisp until the moment it meets the rice. The hand-forming transfers salt from slightly damp hands to the rice surface, which is the original seasoning technique: no soy sauce, no seasoning mix, just lightly salted water on the palms. Rice balls appear in Japanese literature as far back as the 11th century Heian period, and the modern conbini (convenience store) version — sealed in a plastic wrapper with the nori kept separate until eating to maintain crunch — is a packaging engineering achievement. Seven-Eleven Japan's onigiri section is considered a legitimate benchmark for what a good rice ball should taste like.
Rinse the rice under cold water until the water runs clear.
Combine the rice and water in a pot or rice cooker and cook until tender.
Let the rice rest for 10 minutes, then gently fluff.
Prepare your chosen filling and keep portions small.
Lightly wet your hands with water and rub a small amount of salt on your palms.
Take a handful of warm rice and flatten it gently.
Place a small amount of filling in the center.
Fold the rice around the filling and gently shape into a triangle or oval.
If desired, wrap the onigiri with a strip of nori. Serve immediately or store wrapped until ready to eat.
Hand-formed Japanese rice ball with filling (umeboshi, salmon, tuna) wrapped in nori; practical, portable, complete.
Japan; Heian period (794-1185); modern conbini version established in 1970s Japan.
Short-grain Japanese rice (cooked with correct water ratio), filling of choice, nori sheet, salt (hands).
Use rice that is still warm (not hot, not cold) for shaping — warm rice is pliable; cold rice breaks; hot rice burns and becomes too sticky.
Miso soup, pickled vegetables; eaten as a standalone snack or as part of a bento lunch.