The only burger concept among the top 20 on this list, this fast casual declares “We do a common thing uncommonly well.” Burger Lounge emphasizes American grass-fed beef, as well as free-range turkey and an organic quinoa patty to appeal to vegetarians. It serves lunch, dinner and alcohol beverages, and has received funding from investor KarpReilly to fuel its expansion.

LocationLa Jolla, Calif.
2016 Systemwide Sales$28,800,000*
% Change in Sales33.3%
2016 U.S. Units21
% Change in Units50.0%
2016 Average Unit Volume$1,645,000*
% Change in AUV2.8%
Future 50 Year2017