Traditional food of Japan.
This is Onigiri food, do you know that... ? Onigiri is the Japanese name for food in the form of rice that is pressed while still warm so that it is triangular, round, or like a sack of rice.
Also known by another name omusubi, a term that was reportedly used by women in the imperial court to refer to onigiri. Onigiri eaten by hand, not using chopsticks.