Preheat the oven to 325 degrees F. Trim ham of tough outer skin and excess fat. Score top in a diamond pattern, making shallow cuts 1-inch apart. Bake the ham, uncovered, 75 minutes.
Meanwhile, place the remaining ingredients in a pot. Bring to a simmer, whisking to combine the melting jelly with the other ingredients to create the glaze. Simmer for a few minutes, until very lightly thickened, and then remove
from the heat.
When the ham has baked 75 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.