1. Preheat oven to 300 °F (150 °C).
2. Place the ham on a rack in a roasting pan and score the skin on top. Pour about 2 cups (500 mL)of water in the bottom of the pan. Place in oven and bake, uncovered, for 6 to 8 hours.
3. Stir the honey and mustard together and spoon half of glaze over ham and baste, cooking for 1 ½ hours more and basting occasionally. Carve the ham and serve it with the remaining glaze.