MOS burger is a big burger chain in Japan and you can find them in many places. They offer a gluten free slider-size burger (pork patty) and a gf hotdog.
Both are quite small but I’ve found that if you buy a few sliders, along with a salad (no dressing), then you can make a decent meal from them by filling the sliders with lettuce, tomato & onion.
I also carry a bunch of tiny gf sauce bottles around in my bag so I can add extra flavour to the blandest gf option on any menu.
— Very
— Gluten-free items are marked on the main menu
— Not Much
— Average