Smoked meat, smoked meat, smoked meat, smoked meat!
Yes, Schwartz' is the classic traditional touristy spot to go -wouldn't change that for the world. Snowdon Deli is still better food.
If you need a recommendation: lean old-fashioned, side of fries. Boom, done.
Also great: chicken soup, cole slaw, pickles, turkey sandwich, karnatzel (with mustard!).
Parking in the area is tricky, be warned.