Some bento designs require a little extra color to make them look just right. If you've added all the natural ingredients you can possibly stuff into your bento box and it still needs more, you can add a pop of color with food dyes.
Japanese hamburg steak is a take on salisbury steak. It is tender, moist and flavorful. Enrobed in a tangy sweet sauce, it makes for a delightful weeknight meal, and the leftovers (if you have any) are perfect for a bento box lunch.