Saute' sausage, celery, onion and bell pepper in heavy skillet until browned, about :15 minutes. Transfer to a bowl, add other ingredients. Toss well, place in backing dish and cook on grill for :20 minutes
Prepare fillets by cutting deep pockets. Stuff with cool sausage mixture. Cook over moderate heat for :05 minutes per side. Serve over bed of Mashed Sweet Potatoes.