Is there anything to learn from the experience of "The Melt"? It seemed they started with a grilled cheese focus, didn't do so well, and pivoted to burgers. Now they seem to be doing well (however this is only through observation, I have no idea of their finances). It would seem Mac & Cheese would find a similar issue of being too narrow / too niche. Granted, if you don't intend to have in-person location ordering be a big piece of the business, then maybe that is irrelevant.