There are multiple outposts of the popular pozoleria La Casa de Toño all over Mexico City, but only a few of them are open 24 hours, including this one in the Zona Rosa neighborhood.
Whether you've worked up an appetite dancing or need to soak up all the alcohol you've had to drink at one of the Zona Rosa clubs–or maybe you're just hungry at 4 a.m.—La Casa de Toño can fill your belly with a steaming bowl of pozole, a hominy stew piled high with rounds of radish or slivers of avocado, or both.
You won't find tourists here, and it definitely is not fancy, but you will find lots of locals enjoying delicious food. As I said in the title, they have great pozole - my local friend assured me the best in Mexico City. The quesadillas are great too. And it is nearly always open. For some reason, they were restrictive about photos.