Tacos al Pastor, the Mexican version of shawarma, is perhaps the only dish directly associated with the capital. El Huequito (which means “hole-in-the-wall”) has been in business in this spot since 1959. Thinly sliced pork, previously marinated in a complex chile-based sauce, is roasted on a spit, sliced off, topped with chopped onion and coriander, and rolled up in a warm corn tortilla. The meat is juicy and succulent, with a smoky grilled aroma that lingers like a good dream.