>>282020958
Yes. They are plates with random tiny-sized dishes, famires might let you mix and match whatever you want. Common items include omurice, hamburg, sausages, ebifry, purin, napolitan. Some Japanese items, some Western items, whatever you want! Basically a little smorgasbord of kid's comfort food. Speaking as a burger, maybe the closest equivalent would be like a Lunchable or Kid's Cuisine, or just taking the kids to your local buffet, as morbidly burger as that sounds.
The real stereotype, if there is any, is the flag posted in the center of the plate. That's how you really know it's an okosama lunch.
Legend states that it was invented by a Tokyo restauranteur in 1930. It was during the Great Depression, so he wanted to create a meal that would make children happy again.