However, sushi is pretty common. The common diet is rice, fish, veggies. What else is in sushi? So maybe it isn't exactly sushi, but it's the basics of it. Mothers in Japan send their children and husbands off with little cases of rice, fish, and veggies every day. So... Maybe not sushi, but the main ingredients.
Dang, I want a bento... Mmmmm.