These are pinto beans prepared in a broth, the same beans used for refried beans. My wife usually substitutes borracho beans for refried when they are the default part of a restaurant TexMex meal.
I credit Pinto/refried beans for getting me to eat beans, overcoming a childhood dislike. My first introduction to refried beans was on a tostada, and I quickly fell in love with bean burritos, with refried beans, onions, and shredded cheddar cheese.
Of interest (maybe ) TexMex quisine is quite different than True Mexican quisine that I have tasted in places like Nuevo Laredo, Matamoris, Mexico City and Guadalajara.
http://www.nibblesandfeasts.com/2015/07/borracho-beans/
They look very inviting and I would imagine that they are very tasty.
I love good bean dishes; one of my favourite winter pastas (an old peasant dish served to me once by the Italian wife of a former student of mine) is one of pasta and cannellini beans (garlic, onions, and so on also feature in copious quantities).
She was astonished that I liked it, (as did her husband, my former student), explaining that it was peasant comfort food.