Chorizo lard! Fry the chorizo, remove from pan, raise heat, add beans (I do mash the a bit for texture/tradition). Large group? Cook/boil the beans, melt manteca in separate pot, pour into pot of beans. Take a paint mixer attached to a drill and whip to preference.
If you want vegis or meats in your beans, look up "frijoles charros" yum!
If you want vegis or meats in your beans, look up "frijoles charros" yum!