Prepare the ham; Heat oven to 325 degrees F. Trim the skin and the fat to a 1/4 inch layer on the ham. Score the fat in a diamond pattern (using a sharp knife). Insert a whole clove into each cross-hatch, pat the mustard over the top and sides of the ham, and sprinkle with the brown sugar. Pour the maple syrup and chicken broth into a 12 x l7 inch roasting pan. Add the ham. Bake, basting every 30 minutes, for 1 1/2 hours. Add the bourbon, orange juice, and thyme to the pan. Sprinkle the ham with the maple sugar, if desired. Bake basting after 15 minutes, for 30 minutes and remove from the oven.
Prepare the sauce: Strain the pan juices and skim the fat off the top. Add the orange zest and salt, and boil for about 10 minutes. Serve hot with the ham.