Preheat your oven to 180°C (350°F). Place the ham on a rack inside a roasting pan and score the fat in a diamond pattern, about 1 inch apart, to help the glaze seep in and create a beautiful presentation.
In a small saucepan, combine brown sugar, Dijon mustard, orange juice, orange zest, smoked paprika, honey, and apple cider vinegar. Bring the mixture to a gentle simmer over medium heat, stirring until the sugar dissolves and the glaze begins to thicken slightly, filling your kitchen with a sweet and smoky aroma.
Brush the glaze generously over the scored fat and the surface of the ham, focusing on creating an even coating. Use a pastry brush for smooth application, and ensure the entire ham is covered to build flavor and shine.
Place the ham in the oven and bake uncovered for about 20 minutes per kilogram, basting every 20 minutes with additional glaze to develop a rich, caramelized surface. The glaze should bubble and thicken with each basting, filling your kitchen with a mouthwatering scent.
During the last 10 minutes of cooking, apply a second thick coat of glaze and increase the oven temperature to 200°C (390°F) to encourage caramelization. Watch carefully so the glaze turns a deep amber and crackles slightly for that perfect finish.
Once the ham reaches an internal temperature of 60°C (140°F) and the glaze is beautifully caramelized, remove it from the oven and let it rest for at least 15 minutes. This resting period helps the juices redistribute, making each slice tender and juicy.
Carve the ham into slices, showcasing the glossy, caramelized surface and juicy interior. Serve warm, and enjoy the perfect balance of smoky, sweet, and citrus flavors with every bite.