Bug: The "Back" button isn't removed after adding a nested item (e.g., Capuccino -> Large).

Also, you've got a typo on "Cappuccino" :)

I believe I found a few bugs with the kiosk mode:

1. Items are not grouped together when the same item is added at a later time (or is this a feature?)

2. Updating an order changes the price but not the quantity.

3. When selecting the quantity of an item, there is no visual feedback to let you know what number you have clicked on. It's also not obvious that +10 means 11.

4. Orders that have more than 1 item do not contain bullet points.

See http://i.imgur.com/Onpkb.png for some examples. This was within 10-20 seconds of playing with it, there are probably many more.

I'd suggest allowing grouping of items, allowing groups like 'Drinks', 'Sandwiches', etc. It's somewhat confusing in that example because there doesn't appear to be any sort of order to how the items are laid out. That may make some sense for the actual registers (muscle memory is wonderful thing), but if the customer is expected to use that interface themselves, I'd expect it to be a bit more friendly.