[tendom]

I dunno, the whole fast casual movement seems to be catching on here. And most of the fast casual places are catering to people who want a fast meal but with real, fresh, non-processed ingredients. My rule would put a lot more focus on the existence of a drive through window and pre-processed ingredients.

[ma2rten]

I don't think those rules work. Many (nearly all ?) restaurants use some kind of pre-processed ingredients. And many fast-food places don't have a drive through window. In for instance Thailand the entire concept is even completely unheard of.

My rule would be that it's large chain (or copy thereof), "system catering" ( http://en.wikipedia.org/wiki/System_catering ) and the aforementioned pay before you eat rule.