Sauce on the Side is a St. Louis-based fast-casual restaurant chain specializing in calzones. Customers can order from a menu of calzones with pre-determined fillings, or customers can choose to build their own with a range of traditional and non-traditional fillings from pepperoni to figs. Other menu items include salads, desserts, and a wine and beer menu. Everything is made from scratch. The restaurant also includes a 12-seat bar area.