Heat oil in heavy medium skillet over medium heat. Add celery and saute until tender, about 3 minutes. Add shallots and garlic; saute until shallots are tender, about 2 minutes. Transfer mixture to large bowl. Mix in all remaining ingredients except beef broth. Add enough broth to moisten stuffing. Preheat oven to 375°F. Set aside enough stuffing to fill crown roast of pork cavity. Transfer remaining stuffing to 8 1/2 x 4 1/2 x 2 1/2-inch loaf pan. Cover with foil. Bake stuffing in pan alongside roast during last 1 hour of cooking until thermometer inserted into center registers 155°F, about 1 hour. Invert stuffing in pan onto platter. Slice stuffing and serve with roast.