Let the Indiana Kitchen ham stand at room temperature for 90 minutes.
Preheat oven to 275 degrees F. Set the rack at the lowest position. Rinse and pat dry the ham. Using a sharp knife, score the skin of the Indiana Kitchen ham in a criss-cross pattern. Place ham in a roasting pan. Pour just 1 1/2 cups of the cola and 1 1/2 cups of grape juice into the pan and add additional water if necessary to bring the liquid level to 1/2 inch. Cover the pan tightly with tin foil. Roast in oven for 2 3/4 to 3 hours (about 15 minutes per pound) or until the internal temperature of the ham reaches 100 degrees F.
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).
Take the Indiana Kitchen ham out of the oven when it reaches the first internal temperature of 100 degrees F. Turn the oven to 425 degrees F. Brush the ham with about 1/4 of the glaze all over. Use toothpicks to stud the ham with the sliced pineapple, if desired. Once the oven comes to temperature, return the ham, uncovered to oven. Bake for 15 minutes until the liquid is bubbly and the ham has turned to a nice, deep golden brown. The internal temperature of the ham should be 140 degrees F. Remove ham to a cutting board and let rest for 15 minutes.
Return the remaining glaze to the stove on medium-low heat to warm the glaze up for serving. Carve and slice the Indiana Kitchen ham, drizzle a bit of the cola glaze on each plate.
Place Indiana Kitchen ham in shallow roasting pan; score a diamond pattern about 1/8-inch thick into the upper surface of the ham. Position rack in the lower third of the oven; heat to 325 degrees F. Place ham in oven and bake until internal temperature, as measured with a meat thermometer, reads 130 degrees F., about 1 1/2-2 hours.
Meanwhile, in a small saucepan bring the orange juice to a boil; reduce heat to a simmer and reduce the orange juice by about half, stirring occasionally, about 15-20 minutes. Stir in honey, molasses, brown sugar, mustard and pepper. Simmer slowly until thickened, about 25-30 minutes. Set aside.
When Indiana Kitchen ham reaches 130 degrees F., start basting: Using a pastry brush, brush the glaze generously on all surfaces of the ham. Continue to bake for 10 minutes; baste again two more times, until internal temperature of ham reaches 140 degrees F. Remove from the oven and let the ham rest in roasting pan on a rack for at least 10 minutes, or up to 30 minutes. Baste with the drippings in the bottom of the pan a few times before carving.