Trim fat from ham. Slash edges of ham at 1" intervals. Place on a rack in a shallow baking pan. Bake in a 350F degree oven for 30 minutes.

Meanwhile, drain pineapple chunks, reserving juice. If necessary, add water to reserved juice to measure 1/3 cup. In a small saucepan combine brown sugar, cornstarch, and cloves (or nutmeg). Stir in pineapple juice, orange juice and rum, if using. Cook and stir till thickened and bubbly. Cook and stir 2 minutes more. Stir in pineapple chunks and raisins. Heat through. Spoon over ham.