Place pumpkin in baking dish, combine sugar, rums, syrup and honey, pour over pumpkin, sprinkle butter on top, add star anise, cinnamon, bay leaf, cloves and vanilla bean, cover with foil, bake 20 minutes, turn pumpkin over, bake 10 minutes, transfer cooking liquid to pan over medium high, whisk and simmer in cornstarch until thickened, pour over pumpkin; chill 1 hour.