Early man's first sandwich was an unsuccessful combination of lava smeared between portable limestone slabs—a meal that tasted terrible and caused uncomfortable acid reflux. Explore improvements on this invention with today's Groupon: for $5, you get $10 worth of fresh deli fare at The Retro Deli, located inside the Moravian Book Shop in Bethlehem.

The Retro Deli welcomes bibliophiles and fresh-food fanatics alike with a menu boasting made-to-order deli fare. Sandwich gurus slay a slew of hearty handheld meals, each boasting a whopping quarter-pound mound of freshly sliced Boar's Head meats and cheeses. Regale flavor receptacles with a sandwich loaded with hot pastrami ($6.75), corned-beef brisket ($6.75), or Deluxe Brand ham ($5.99). Veggie-philes can dive mandible first into a made-to-order salad, such as the salad lover's salad—a pasture of lettuce topped with all-white-meat chicken salad, tuna salad, or baked marinated tofu, and served alongside a choice of house-made dressing ($6.85). Early risers can start their days with yogurt-berry parfaits ($3.50) or rev up stomach engines with egg-and-cheese sandwiches ($2.45–$2.95) and jumper cables.