Like the Earth, a sandwich is made of layers and gathers its strength from its meaty core, which pushes condiments toward the crust to erupt and bury fingers in deliciousness. Let rivers of mayo magma run with today's Groupon: for $5, you get $10 worth of sandwiches and more at Groucho's Deli in Rock Hill.

Groucho's has been serving deli-style favorites to South Carolina's sandwich set since 1941. The menu features a sea of sandwiches ($3.79–$7.09), including traditional corned beef on rye, chicken salad, and the house specialty, Baby Sub, a warm combo of salami, bologna, provolone, herb slaw, and lean ham. Groucho's woos salad skeptics with its Just Bacon Salad—4 ounces of real bacon crumbs mounded on a smoke screen of greens ($5.09). Running the gamut of heart health, it also offers a sizeable selection of low-fat alternatives and vegetarian options. If kosher dills inspire intense thirst or desires to soak fingertips in carbonation, Groucho's carries bottled beer and Dr. Brown's soda.