In a small saucepan, combine jelly, mustard, lemon juice and nutmeg; bring to a boil, stirring constantly. Remove from the heat; set aside. Score the surface of the ham, making diamond shapes 1/2 in. deep; insert a clove in each diamond. Place ham on a rack in a shallow roasting pan. Bake, uncovered, at 325° for 20 minutes per pound or until a meat thermometer reads 140°. During the last 30 minutes of baking, brush with glaze twice. Garnish with apple rings if desired. Yield: 8-10 servings.