Andrew A.
Yelp
Tierra del Sol two carts down attracts the lines, but Principe is my favorite cart in the awesome Mercado.
First, know this is Yucatan-style Mexican food, the menu is very different than what you see at traditional Mexican food carts and restaurants. That said, you're in for a treat if you haven't experienced dishes from the region. If you have, the popular Salbutes and Panuchos are excellent, and they have Cochinita Pibil.
Venture a bit by opting for the lesser known dishes such as Huevos Motulenos, which perfectly hits the spot for brunch. The Kibis were so good, less dense than their Middle Eastern cousin.
The Habenero sauce that comes with most dishes is hot.
Service speed was about average for the Mercado.