 So big is the popularity of these sandwiches in San Miguel de Tucumán, that a monument to this food was built in 2013, by local artist Sandro Pereira.Sandwicherías have been the main competitors to foreign fast food chains such as McDonald's, Burger King or Subway in Tucumán, with some of them selling as much as 500 sandwiches per night.There is also an annual "Expo Milanga", which is celebrated every 18 March, commemorating the death of José "Chacho" Leguizamón, founder of one of the most traditional sandwicherías in the city.