Suffice it to say that in Chile, there is a specific kitchen job called Maestro Sanguchero, a chef that only does sandwiches.
Sandwiches are a well-loved and traditional quick lunch in restaurants in the city or near the highway.
The variety of toppings and combinations is fabulous, and you can go without repeating yourself for maybe a month.
Some classic restaurants in Santiago are El rápido or Dominó for completos. Fuente CHilena, Fuente Alemana, Tip Tap for sandwiches.