Preheat oven to 325°F.
Place 10–12 lb. ham on roasting rack flat side down in roasting pan.
Coat ham with approx. 1/3 of glaze and cover loosely with aluminum foil.
Bake for 2–2 1/2 hours, until instant-read thermometer inserted into center of ham measures 130°F–140°F.
Remove ham from oven and increase temperature to 425°F.
Remove foil and brush ham with another 1/3 of glaze.
Return ham to oven for approx. 5 minutes.
Remove ham from oven and coat with remaining 1/3 of glaze.
Return to oven and cook for 5–10 minutes. Monitor cooking closely to avoid burning glaze. It should turn a rich, deep ruby color.
Remove ham from oven, tent loosely with foil and let rest for 20 minutes.
Transfer to large cutting board to slice.
Store leftovers in refrigerator.

Williams Sonoma Roasting Glaze, Spiced Cherry Bourbon