Actually, I am considering getting in the food court stall business. From a quick look I found that the profit on these can be about $30,000 a year, so if a person gets two of them in the same food court (easy to supervise) you can bring in pretty good money and every few years get a new stall ...
You are better off getting a food truck. There was a show that rated the 10 best mobile food trucks out there. The best one I thought was called Sams chowder house. They would do an outdoor clambake with lobster, clams, corn, and red potatoes. The others were serving a custom niche and appearing to make a fortune doing it. There was ice cream, waffles, french food, korean-mexican, pulled pork sandwiches, pastries and donuts. All of them were custom and unique. And all of them were mobile food trucks where they cook the food right there on the spot. The most successful ones looked to be in the downtown areas. One building full of hungry people can result in a profitable venture.