Place lamb in a 5- or 6-qt. oval slow cooker. Add pears and shallots. Combine 1/4 cup orange juice, 1/4 cup pomegranate juice, honey and seasonings; add to slow cooker., Cook, covered, on low until meat is tender, 6-8 hours. Remove lamb to a rimmed serving platter; keep warm. Stir remaining orange and pomegranate juices into cooking liquid; pour over lamb. Sprinkle with pomegranate seeds and parsley. If desired, serve over couscous.