I made a large batch of my mother-in-law's vegetable kakiage fritters (Recipe ID: 1684951) and pack them in a bento. They're great to serve at breakfast too.
A friend informed me that frozen tempura is great for bento-making, and I've been following her tip every since.The sauce is really simple, and can easily be whipped up on busy mornings.
Keep a close eye when toasting as the kakiage is prone to scorching. If the heat is still on when you add the sauce, it'll boil down so turn it off immediately and then pour.
Enjoy Japanese food around the world.