Onigiri (ãŠæ¡ã‚Š or 御æ¡ã‚Š; ãŠã«ãŽã‚Š), also known as omusubi (ãŠçµã³; ãŠã‚€ã™ã³) or rice ball, is a Japanese food made from white rice formed into triangular or oval shapes and often wrapped in nori (seaweed). This rice ball is a home cooking rooted in the American occupation of Okinawa in Japan after World War II.