Preheat the oven to 325°F. Trim ham of any excess tough outer skin. Set the ham, fatty side up, in shallow roasting pan. Score top in a diamond pattern, making shallow cuts about 1-inch apart. Bake the ham, uncovered, 80 minutes.
While ham bakes, place the remaining ingredients in a small pot. Bring to a simmer, whisking to combine the melting jam with the other ingredients to create the glaze. Simmer 2 minutes, and then remove from the heat.
When the ham has baked 80 minutes, baste with 1/3 of the glaze and bake 10 minutes more. Repeat these steps twice more. Transfer the ham to a serving platter, tent with foil, rest 15 minutes, and then slice and serve.