Baked Ham With Brown Sugar Glaze

Preheat oven to 325º. Place ham on a roasting rack set in a roasting pan and score diagonally. Cover with foil and bake until warmed throughout, 2 1/2 to 3 hours. During the last 45 minutes of cooking, make glaze: In a small saucepan over medium heat, whisk together brown sugar, mustard, apple cider vinegar, and apple cider. Bring up to a boil, then reduce to a medium simmer and cook until reduced by half, 10 to 15 minutes. Brush glaze on ham every 15 minutes, until until an instant-read thermometer inserted in the thickest part reads 140°. Remove ham from oven and let rest 15 minutes before slicing.