Potts' hot dogs are a great treat. My personal favorite is chili, cheese, onions and mustard. Although you certainly can't go wrong with a traditional sauerkraut, onions and mustard. There is nothing like cheese whiz out of a can to make a dog sing!
I think the Bethlehem location is the original, but there are few other locations around the Lehigh Valley. This locations suits those from Moravian College as well as seniors from nearby Liberty High School who are taking an "unauthorized" off-site lunch.