Potbelly Corporation, more commonly known as Potbelly Sandwich Shop or Potbelly Sandwich Works, is a publicly traded American fast-casual restaurant chain that focuses on submarine sandwiches and milkshakes. Potbelly was founded in 1977 in Chicago, and its name refers to the potbelly stove. Potbelly's menu features a variety of sandwiches that are all served hot, and the menu includes soup, shakes, smoothies, potato chips and cookies. Some locations formerly presented live music from local musicians during the lunch hours. Wikipedia