This was my initial thought too. When you start selling food for money things get complicated quick. If you look at some of the actions against shared kitchens and such it's disturbing. You'll want to look into this ASAP as it's complicated by locality and directly impacts your business model. It might be that you could have "food points" that you get when you cook and spend when you eat and essentially trade meals but I'm not sure if that's actually ok legally or if it works with what you're thinking about.
