When I worked as a welder in a shipyard, very often I would get a pre-chosen lunch set from one of the multitude of taco trucks that showed up. It ranged from regular, professional trucks where you could order from a menu, on down to the wives of the workers selling tamales or the like out of the trunk of their cars to make a little extra on the side.

Nine times out of ten I'd usually just get the meal of the day from one of the ladies. It was always good, and it was actually kind of fun to wonder what you were going to get! I definitely see the appeal of not having to think about it.