Krystal is an American fast food restaurant chain headquartered in Dunwoody, Georgia, with restaurants in the Southeastern United States. It is known for its small, square hamburgers, called sliders in places other than the Southeast, with steamed-in onions. Krystal moved its corporate headquarters from Chattanooga, Tennessee, where it had been based since 1932, to the Atlanta suburb of Dunwoody in early 2013.