Mix glaze ingredients in a saucepan and cook, stirring, over med-low heat until mixture reduces to one third cup; set aside until needed.

Preheat oven  to 325°F.

Lightly score ham around the outside on the skin and spritz with oil spray.

Place ham cut side down in a heavy bottomed baking dish.

Bake ham for about two hours, basting with glaze mixture occasionally, and turning ham to its side and shielding the cut side with foil to be able to glaze all sides (foil keeps the cut edge from drying out).

When ham reaches 130°-140°F. internally, place it under the broiler for a minute or so to caramelize the glaze.

Let sit 10 minutes before carving.