Once upon a time I worked in an office building where everyday during lunch hour somebody came to sell hot food for lunch. Every day was something different. It was never a huge set up. The building provided a long table. They never cooked the food there, was always already prepared off site.

My question is 1. is this what you all are referring to as a "commissary"? 2. While I the idea of a food truck appeals to me, I am wondering if this is something that is still done? Can be done?

I ask because I am currently working for a large office building, they have a large lunch room with just vending machines and with no time to go out for lunch.