or this bento I used a frozen rice ball from the last time I made sushi to make the yaki onigiri, and it worked great - this will work well for bento supplies I can keep on hand in the freezer. I microwaved the rice ball for a minute and then proceeded to grill it on each side as is, then again brushed with soy sauce. I let it cool before putting it in the bento box. According to Lunch in a Box, they can be frozen after the grilling part as well.

Contents: Celery with cream cheese, homemade oatmeal chocolate chip cookies (from frozen dough balls), orange wedges, hardboiled egg with s+p packet, and yaki onigiri.