Remove foil and parchment from ham. Drain and discard liquids from roasting pan. Cut off rind and all but 1/4-inch-thick layer of fat from ham and discard. Using long sharp knife, score fat in 1-inch-wide, 1/4-inch-deep diamond pattern. Spread mustard evenly over fat layer on ham. Pat brown sugar over mustard coating, pressing firmly to adhere. Drizzle honey evenly over. Bake until ham is well glazed, spooning any mustard and sugar glaze that slides into roasting pan back over ham, about 30 minutes. Transfer ham to serving platter; let cool at least 45 minutes. Slice ham and serve slightly warm or at room temperature.