Score ham diagonally in both directions to make diamond shape scores.
Rub brown sugar all over ham. Place cloves in cross sections. Place pineapple rings over ham. Pour pineapple juice in bottom of pan with left over brown sugar for glaze. Place oven safe thermometer in thick end of ham. Do not touch bone.
Bake in 350 degrees F oven until done (ham reaches internal temperature of 140°F when tested in center with meat thermometer). Time varies to size of ham.