Krystal is an American fast food restaurant chain headquartered in Atlanta, Georgia.”Sweepstakes Rules.” (Krystal moving headquarters to Atlanta | timesfreepress.com It is known for its small, square hamburger sliders with steamed-in onions. Krystal is popular with people of all ages, and was famous in the 2000s for competitive eating contests, including one in which a record-holding participant ate over 100 hamburgers in a matter of minutes. Krystal moved its corporate headquarters from Chattanooga, Tennessee, where it had been based since 1932, to Atlanta in early 2013.Krystal moving headquarters to Atlanta | timesfreepress.com