Onigiri

Like a lot of Japanese I've become a big fan of Onigiri or rice balls; I especially enjoy them filled with salmon. Their convenience and cost (less than $1 each make them great for travel so you seem a lot of them in train stations and in convenience stores. I usually buy one or a bento box when traveling by train or bus for some distance. They are wrapped in nori (seaweed) which help hold the rice together and vice them.a crunch. There is a trick to unwrapping the plastic; if done wrong (as I've done) when the  the plastic wrapper is removed the nori will also be removed. It took this western mind a few tries to figure it out:)