makes enough glaze for a 6-pound ham, serving 12–14 people (double recipe if you are cooking a larger ham)
You've got your ham in the oven, right? Set it in a pie plate or other serving dish, stud with cloves and cover with foil. Low heat, like 325° F, will do it, about 45 minutes for 6 pounds or less.
For the glaze: combine the brown sugar, mustard, and apple cider vinegar in a small, heavy bottomed saucepan. Bring to boil and simmer until slightly thickened, about 10 minutes. Remove ham from oven, take off the foil, and brush or drizzle the glaze all over. Crank up the heat to 375 and return ham to oven for final 30 minutes or so cooking; watch for glaze to caramelize, but stop shy of burning. Remove ham from oven and let rest for 15 minutes before serving. Enjoy your feast!