My friend Mojdeh does cultural tours in Mexico City, and for more than a year we’ve been planning for me to go visit her neighborhood south of town. She lives in the Colonia Santo Domingo near Metro Copilco, almost to the UNAM.
There are several tianguis (the Nahuatl word meaning outdoor neighborhood market) in Santo Domingo. The one near her house is on Coyamel street on Wednesdays.
She told me I was going to love it, and she was right. The Coyamel tianguis was larger than the two markets near my house, full of people eating and saying hi to each other and pushing shopping trolleys. Smoke billowed from a taco stand offering fresh cecina cooked on a wood-fired grill. Mojdeh and I waited 30 minutes, along with 15 other people, just for tortillas — one woman sold blue and white versions, plus sopes, tlacoyos and gorditas out of big boxes lined with dish towels. Her steamy, delicate blancas were worth the wait.
We ate and wandered, and ate some more. I bought some gorgeous tomatillos that the vendor told me were from Ixtlahuaca, past Toluca. I bought fresh requesón and homemade pan de pulque, and a white zapote, which tastes kind of like sweet avocado. And I spotted a quelite I’d never seen before — trébol de carretilla (medicago polymorpha).
A few photos:

Spotted this unusual cinnamon bark. The vendor said he grows it in Tuxtla, Veracruz. It smelled much more intense than the usual Mexican cinnamon.

A taco with grilled cecina and longaniza. This tasted even better with a few spoonfuls of crema on top.
Here’s a map to the location, in case you want to visit yourself someday (click to open in Google maps):