Paying homage to the owner’s St. Louis roots and 1980s nostalgia, Mellow Mushroom’s out-of-ground franchise location in Cottleville is a one-of-a-kind casual dining experience. Custom wood slabs cleverly cut to different depths and lengths create a subtle optical illusion of movement from the exterior, while a magenta portal over the main entrance draws hungry guests to the restaurant’s interior that boasts some distinct features.