We'll, tonight, thanks to Kevlar's thinking and my coding, they now will remember what you last asked for. This means that you can order a 'sandwich' and Sally can tell you that she 'can get you a cajun, an original or a BBQ' and you can then tell her 'cajun' and she'll know to get you a cajun sandwich.
Kev noticed that you guys already order like this and then are forced to learn it the hard way, so it was a good idea to support the manner in which you were already ordering.
Additionally, bartenders can tell you what is on the menu and how well business is doing. Just ask.