Place ham fat-side up in a shallow roasting pan. Press cloves into top of ham; stir together pineapple juice and syrup and pour over ham. Arrange pineapple slices on ham. Bake at 325 degrees for 1-1/2 hours. Add water and bake for an additional 1-1/2 hours. Remove from oven; remove pineapple slices. Mix together brown sugar and mustard; spread over ham. Bake for an additional 30 minutes.