Chipotle amazes.

http://entrepreneurs.about.com/od/casestudies/a/Entrepreneurial-Success-Story-Chipotle.htm
http://restaurant-hospitality.com/eat-beat-business/steve-ells-chipotle-s-two-decade-success-story
http://www.slate.com/articles/business/moneybox/2012/02/chipotle_is_apple_how_the_burrito_chain_is_revolutionizing_fast_food_.html