Dried, salty things, such as umeboshi (pickled plums), katsuobushi (bonito flakes), and kombu, tend to last longer than fresh ingredients like tuna, spam, or salmon. If you intend to make onigiri ...

Her gu gets adventurous. Cream cheese is mixed with a pungent Japanese pickle called “iburigakko,” for instance, and each onigiri costs 250 yen ($1.60). Spam and egg onigiri costs 300 yen ($1. ...