To prepare stew, trim fat from pork. Place pork and next 5 ingredients (pork through garlic) in an electric slow cooker. Cover with lid, and cook on low-heat setting for 8 hours. Remove pork from slow cooker, and coarsely chop. Add peanut butter to liquid in slow cooker; stir well. Stir in pork.
Combine stew and rice in a large bowl. Top each serving with onions and peanuts; serve with lime wedges.