* If you can't find wasabi paste, I have used Kikkomon 'Wasabi Sauce' - it can be found in the condiment aisle in most grocery stores.
* If you plan on saving your Ongiri for a snack, bento box, or picnic, wrap each Onigiri individually in plastic wrap to prevent the rice from drying out. Ideally, you want to eat them the same day they're made. However, if you refrigerate them for the next day you may find that the rice has dried out a bit. In that case, you can bring new life to them by toasting the rice balls in a dry non-stick pan over medium-high heat. Toast until the outside becomes lightly browned and then brush with a mixture of soy sauce and sesame oil.