Remove ham from refrigerator and bring up to room temperature. Preheat oven to 250˚F and place oven rack at the lowest position.
Once ham has come up to room temp, tightly wrap the ham in foil, transfer to the oven and bake 1 1/2 hours, until the internal temperature reaches 100˚F. (The ham has already has been cooked so don’t be afraid of the internal temperature only reaching 100˚F.)
Meanwhile, prepare the glaze: In a medium-size saucepot, add the rest of the ingredients and bring up to a boil. Stir to fully dissolve the brown sugar and reserve.