Preheat oven to 350 degrees

Score top of ham into diamonds and stud center of each diamond with a clove. Place ham on a rack in a roasting pan and bake for 1 1/2 hours.

In a bowl combine the sugar, mustard and vinegar and spread glaze evenly over ham. Bake for another 35 minutes.

Transfer ham to a platter and let stand 15 minutes before carving.

This recipe yields 12 servings with leftovers.