Preheat your oven to 300ºF. Starting 4 inches from the end of the ham, trim off the skin and fat, leaving about 1/4 inch of fat. Place the ham in a large heavy pan with a lid. Pour 1 can of the Coco-Cola over the ham. Add 1/2 inch of water. Cover tightly and bake for 1 hour. Remove the cover. Pour the other can of Coca-cola over the ham. Leave uncovered and bake for another 2 hours. Score the cooked ham in a large crisscross pattern. Place a pineapple ring with a cherry pierced by a clove in each scored segment. Let the ham sit in a warm place for 30 minutes before serving so that it will carve easily.