Hi Eric, the beans served here are seldom refried, unless they are served with "totopos" as a bar snack. The popular ones are either black beans, pinto-type beans, or something they call "frijol bayo", kind of a whitish bean. All of these are often served with some crumbly queso fresco as a garnish. We like "frijoles charros", which are seasoned with chiles, tomato, onion, garlic and usually a little chorizo. But the "frijoles de olla" in this region are usually just cooked with onion and garlic and maybe some epazote (a very strong herb, so you just use a little bit). I also love peruano beans, that are a creamy white bean. Not sure if you can find them in the US, but maybe in Austin. Beans are the main part of the diet for most people, with tortillas, which sell fresh for only 8-9 pesos a kilo (80-90 cents). Meat is used sparingly.
We have some very good friends who moved here from Austin...nice people! Hope this helps.