A question about a recipe: Tomatillo White Beans and Shredded Pork Tacos

Another approach would be to braise the pork in a Ditch oven in a low heat (325 degree) oven, then puree the sauce and add the beans and continue cooking in the oven, similar to this recipe:
http://www.food52.com/recipes/11316_coffee_infused_braised_lamb_shanks_and_beans

You could certainly make this without slow cooker. Cook the pork and tomatillos on the stovetop, covered, in a large Dutch over for a couple of hours. Then remove the pork, puree the tomatillo sauce, add the dried beans and the pork, and simmer on low, covered, for a few hours until the beans are soft (the timing will depend a lot on the dryness of the beans). You will want to keep an eye on the liquid level and make sure the beans stay submerged.