Ingredients
1 (10 lb.) fully cooked whole ham (boneless or bone-in)
½ cup packed brown sugar
¼ cup Dijon mustard
1 tablespoon apple cider vinegar
1 ½ cups apple cider
Directions
1) Preheat oven to 325 degrees. Place ham on a roasting rack set in a roasting pan and score diagonally. Cover with foil and bake until warmed throughout, 2 ½ to 3 hours.
2) 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 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 an instant-read thermometer inserted in the thickest part reads 140 degrees.
3) Remove ham from oven, give one final glaze, and let rest 15 minutes before slicing.