I guess an app could give people access to a webcam to engage in discussion with a cook as they prepare the food, for people who really want to watch the process and talk to the cook.. is that a feature you'd be interested in?
I mean, obviously, that wouldn't be right for a lot of places -- many eateries don't want people bothering the kitchen staff -- but if you've been going to places where people can interact with the kitchen-staff as they work, and if that's something the customers value, it'd seem like that process could be made more available.
Edit: Actually, when you were talking about engaging kitchen-staff, were you thinking of places like Subway? Or did you mean actually talking to people in a separate-kitchen, like you walk back there and chat with them while they make the food?