Preheat your oven to 325°F (165°C) and prepare your shallow roasting pan with a rack.

In a small bowl, combine brown sugar, orange marmalade, and Dijon mustard to form a smooth glaze. Set aside.

Score the surface of the ham in diamond shapes and insert whole cloves into the center of each diamond.

Place the scored ham cut-side down onto the rack in the roasting pan, ensuring even cooking.

Bake uncovered for about 2 hours or until internal temperature reaches 130°F.

Remove from oven, brush the glaze onto the surface, and continue baking for an additional 10 to 15 minutes until reaching 140°F.

Let the ham rest for 10 to 20 minutes before carving for juicy slices.