In a large slow cooker, add the onions, collards and celery.
In a small bowl, mix the remaining ingredients, except the broth, and rub evenly all over the pork.
Place the pork over the vegetables, pour in the broth and cover slow cooker. Cook on LOW for 6 to 8 hours, until the pork is falling apart and tender. Remove half the pork and set aside for lunch the next day (Pork and Fennel Salad Bowl). Serve the remaining pork with vegetables.