Baked Ham with Peach-Mustard Glaze 1 large ham, ready to cook, about 10 to 12 pounds 1 cup peach preserves or peach jam 2 tbs spicy brown mustard Heat oven to 350°. Place the ham on a rack, fat side up, in a large baking pan or roasting pan. Score the ham lightly all over with a sharp knife. Add 1 1/2 cups of water to the pan and cover tightly with foil. Bake the ham for about 18 minutes per pound, or to an internal temperature of 148°. Meanwhile, combine the preserves and mustard to make the glaze. About 20 minutes before the ham is done, brush the ham all over with glaze ingredients. Serves 8.