Founder Bill Waugh also founded Casa Bonita, a chain with one location remaining in Lakewood, Colorado. It was featured on an episode of South Park. See Casa Bonita (South Park episode) See also List of Texas companies (T) References External links Official website Companies based in Irving, Texas Economy of the Southwestern United States Regional restaurant chains in the United States Fast-food chains of the United States Fast-food Mexican restaurants Restaurants established in 1967 1967 establishments in Texas TPG Capital companies 1981 mergers and acquisitions 1996 mergers and acquisitions 2001 mergers and acquisitions 2005 mergers and acquisitions 2015 mergers and acquisitions Companies that filed for Chapter 11 bankruptcy in 2018 2019 mergers and acquisitions