[basicallydan]

That's a nice side-effect, yes!

Restaurants are an easier place to start, and in fact there are some services which already have databases of restaurants' menus.

As for RFID - I think a lot of people go there at first when discussing a solution to this problem. It might work just fine for smaller shops but in order to get it all over you need it built into the supply chain from the moment something steps out from being manufactured.