It’s hard to know where to start when writing a single post about street food in Mexico City. From flautas, tamales, chicharrón, gorditas, quesadillas, tlacoyos, huaraches, panuchos, tlacoyos, huaraches to all manner of tacos and tortas. Whole books, blogs, Twitter and Instagram streams have been dedicated to cataloging the best of the best. And street vendors in Mexico City…