I go there about twice a month and feel fortunate that there are still places like it in the area. If you can restrain yourself from snacking at the market, have lunch at the classic Roadfood establishment right next door - the Ritz Barbeque.
This is not the smoky pitmade BBQ as served in the south but the far-removed PA Dutch version - chips of roasted ham, beef, pork or turkey with a tangy sweetish sauce and onions on top. A BBQ plate comes with fries and IMO, the best pepper cabbage in the area. That's a side of beans baked with more sugary sauce and the "scribs" from the baked ham and bacon ends. (Both the pepper cabbage and beans are available in pint containers to go.)
Another one of my favorites there is the hot roast beef and turkey sandwiches with real grandma-type gravy and mashed potatoes. Typical "today's specials" are 1) Baked fresh sausage served with noodles&cabbage and buttered corn and 2) "Our own made" chicken croquettes, gravy, potato filling and stewed tomatoes.
The Ritz is renowned in the Lehigh Valley for their homemade ice cream and crumb-topped fruit pies. The ice cream, shakes and malts are so popular that there's a window open to the parking lot for dessert sales.
Sorry to change the subject but if you're there, didn't want you to miss it.