I thought you'd want to know, round
rice balls are usually served after funerals in Japanese - Hawaiian culture (not sure if this is so in Japan,
where serving someone a rounded scoop of
rice is seen as an insult for the same reason — this is an offering for the dead).
Although sushi in various forms has been around for fourteen centuries, the modern version was invented in Japan in the 1800's
where a «hand - formed» sliced fresh fish and vinegared
rice ball was eaten as a snack food.