While the Indiana Kitchen ham is cooking, prepare the glaze. Combine the remaining 1 cup grape juice, 1 cup cola, the juice from the pineapple (reserve the pineapple slices for later) and the brown sugar in a small sauce pot and simmer on low for 20 minutes, until it becomes thick and glossy. Let stand at room temperature until ready to use (as the glaze cools, it will thicken up, making it easier to brush on the ham).