Remove ham from packaging and reserve any juices. Preheat oven to 325 degrees. In small saucepan, heat butter until melted and add brown sugar and reserved ham juices and pineapple juice. Bring to slow boil over medium heat and then turn to simmer. Simmer 5 minutes, then set aside.

Place ham in roasting pan face-down. With a good sharp knife score the skin in “checkerboard” fashion. On each “square” push one clove into middle of the square. Continue this until outside rind of ham is completely dotted with cloves. With a basting brush, baste the prepared sauce all over ham. Place in oven for 1 hour. Remove ham from oven and baste again. Decorate with pineapple rings and place back in the oven for ½ hour. Remove from oven, baste again and serve.