My kids and I spend Wednesdays out in the woods either hiking, biking, or letterboxing. We have to take a huge lunch with us and usually it's a Japanese-style bento with onigiri, some protein item, and lots of vegies and pickles. More often than not, my kids will pick this for the protein...it's basically a french hamburger recipe that has been adapted for our bento lunches. Cooking time will vary with how large your patties are. The sauce is a true basting sauce and these will not be in a soupy sort of base. The point of bentos is to make the food as fuss-free to eat as possible. The meat mixture is soft and a bit tricky to work with, but the result is a moist patty that doesn't need condiments and isn't a rubbery hard superball.