Morning prep time: 20 minutes for two bentos, including cook & cool time. Great way to use up leftover pasta from earlier meals. Full details and additional child's version of this lunch are here at Lunch in a Box.
I found an uncommon sandwich variation on the Japanese Bento Box Song, and made a video of me singing it with the associated hand motions. What was I thinking?! Full post with video, lyrics & English translation is here at Lunch in a Box.