At Mexico City’s Tacos El Califa de León, there are only four things on the menu, all tacos, and all of which came from a cow’s rib, loin or fore shank. El Califa de León is the only taco stand among the 16 Mexican restaurants given one star, as well as two eateries that got two stars. In a way, El Califa de León is a tribute to resistance to change. A worker hands a customer his order of tacos at the Tacos El Califa de León taco stand, in Mexico City ( Copyright 2024 The Associated Press. The most loyal customer base for El Califa de León originally came from politicians of the old ruling PRI party, whose headquarters is about five blocks away.