How to Make It
Preheat oven to 325°F.
Line a roasting pan with aluminum foil. Place ham on a rack in prepared pan. Using a sharp knife, make shallow cuts in fat. Pour 1 cup Champagne over ham; sprinkle with 1 cup brown sugar. Cover ham with foil.
Combine syrup, crushed pineapple, mustard, cloves, remaining Champagne, and remaining brown sugar in a medium saucepan. Bring to a boil over high; reduce heat to medium, and simmer until alcohol flavor has cooked out, about 5 minutes.
Place ham in oven; bake for 1 hour. Uncover and baste with maple syrup mixture. Cover ham; bake 1 hour. Uncover, baste, and return to oven; bake ham, uncovered, basting every 10 minutes, until a thermometer inserted in center of ham registers 115°F, about 30 additional minutes. Top with pineapple slices, if desired. Let stand 10 minutes before slicing.