I depends but for larger groups of people you'd likely have something very similar to a university dorm cafeteria ya. Like a dedicated team of cooks who prepare the food, and you come pick out what you want. You could even have them deliver meals to people who are sick and stuff. Since it would all be within easy walking distance of your sleeping area in a commune like setup.

Think like big commercial kitchen that makes tons of food, at set times of day (Breakfast, Lunch, Dinner) and people come by and pick up what they want, and can choose to eat there at some tables with others, or bring the food back to their room, or anywhere else really.

Since its a community and youd all know eachother well you could also work around dietary restrictions. Like if you know you've got 50 people to feed, and 15 are vegan you can prepare the right amount of food options for the vegan group so its there for them when they come.

You could potentially even have a local network setup where you can go on there and have a few options to select what you want to eat that day and it gets sent to the kitchen, and they know what each person is going to pick so they can have it all ready in the right amounts.