Season the rice before you shape into balls, then grill them. This will save you the trouble of brushing them soy sauce before you start cooking them. Their crunchy toastiness will get your appetite going.
We tried grilling rice balls at a barbecue.
When you don't have any time, you can just use plain unseasoned rice. The important part is grilling them.Make sure to allow the soy sauce to mix thoroughly in with the rice before you drizzle in the sesame oil.
Enjoy Japanese food around the world.