Approx one third cup water In oven casserole, put chicken. Pour rum over chicken. Let sit 10 minutes. Sprinkle with thyme. Pour in water. Place yams around chicken. Sprinkle yams and chicken with cinnamon. Toss in raisins. Sprinkle all with ginger and brown sugar. Cover and cook at 180ºC or half hour. Uncover and check that gravy is covering meat. Add water as necessary. Dot yams with butter or margarine. Re-cover and cook another half hour or until yams are tender ----