For the filling, the rice is usually seasoned the classic sushi way -- with rice vinegar and sugar. Crumbled nori seaweed is often mixed through the rice too, before shaping it into balls and ...

Starting on Jan. 27, the prices of onigiri rice balls at the stores will jump by up to 28 yen (18 cents), while the cost of bento lunch boxes and sushi will rise by as much as 60 yen beginning on ...