
This is beyond any doubt the BEST ham I have ever tasted - and the secret is all in the Ham Glaze.
Remove the ham from the refrigerator 1-2 hours before it needs to go into the oven. This will allow the meat to come a bit closer to room temperature before it goes into the oven.
Preheat the oven to 325 degrees. Line a large roasting pan or a heavy-rimmed baking sheet with foil and place the ham cut side down in the pan. Roast for 45-50 minutes. While the ham begins roasting, combine the sugar, vinegar, and mustard in a small cup or bowl. Set aside next to the stove.
Remove the ham from the oven and baste generously with the glaze, using about ¼ of the glaze. Continue to roast the ham until it is deep brown and glazed, brushing the ham with more glaze every 10 minutes or so.
Transfer the ham to a large platter and let rest for 10-15 minutes prior to slicing.