Place pork in a roasting pan. Pour Worcestershire over pork. Combine sugar, thyme and pepper. Pat sugar mixture over meat to form a sort of crust. Pour water or juice into bottom of pan. Place pork in oven and immediately reduce temperature to 250F. Cook 4 hours, uncovered, or until meat thermometer registers 160F. Remove meat from pan. Add salt to juices and serve with sliced or pulled pork.