Originally Posted by DeathSlam

Japanese are very particular about their food. I think rice balls (onigiri) are their equivalent of Greggs, but healthier and more tasty.
Have you tried the ekiben (Railway bento box) yet? Next time you go for a long Shinkansen ride from a major station go a bit early and browse the offerings you can buy to eat on the train. Not always super cheap and not as good as what you can get in bricks and mortar restaurants, but a fascinating concept well embedded in Japanese culture.