Add the chicken broth to the skillet and bring to a boil, scraping up the browned bits from the bottom. Pour the broth into the slow cooker. Add the tomatillos, onion, garlic and jalapeño. Cover and cook on high for 3 1/2 hours, until the pork is tender and the tomatillos have broken down and formed a sauce, about 3 1/2 hours. Add the hominy and cook for 30 minutes longer.