Sonic's All-American Smasher features a smashed, crispy-edged beef patty with melted American cheese, crinkle-cut pickles, diced onions, ketchup, and mustard on a toasted bun. Sonic's entry into the smash burger trend, it competes with Jack in the Box's Smashed Jack and McDonald's classics for people who want that thin, caramelized patty with maximum crust-to-meat ratio.