Preheat oven to 325ºF. Score ham at 1-inch intervals with a sharp knife; place in baking dish. If ham appears dry, moisten surface with water. Combine black pepper, mustard and garlic powder in a small bowl.
Rub pepper mixture over surface. Roast according to manufacturer's directions.
Combine honey, cinnamon and cloves. Drizzle over ham during the last 30 minutes of roasting. Remove ham from oven and let rest 20 minutes before slicing.