Before wrapping, or even making the onigiri, though, you have to pick your fillings. Some popular fillings for this classic rice ball dish are umeboshi or pickled plum, which adds a salty ...

For instance, “Kaitaku onigiri” (Pioneers’ onigiri) had umeboshi (salted pickled plum) for its filling, a sprinkling of salt and sesame on the rice, and was slightly grilled before it was ...