Preheat your oven to 165°C (330°F). Place the ham on a cutting board and score the skin in a diamond pattern, about 1 cm deep, to help the glaze soak in and create a decorative look.
In a bowl, whisk together honey, Dijon mustard, orange juice, and brown sugar until well combined. This mixture will become the flavorful glaze that coats the ham.
Use a basting brush to generously apply the glaze over the scored ham, making sure to get into all the crevices. This first coat will start the flavor infusion.
Place the ham in a roasting pan and bake uncovered for about 1.5 to 2 hours, basting with the remaining glaze every 30 minutes. The aroma of citrus and honey will fill your kitchen as the glaze begins to caramelize.
During the last 20 minutes of baking, increase the oven temperature to 200°C (390°F) to help the glaze bubble and turn a rich, golden brown. Keep an eye on it to prevent burning.
Once the glaze is bubbling and the edges are caramelized, remove the ham from the oven and let it rest for about 15 minutes. This allows the juices to redistribute and makes slicing easier.
Slice the ham into thick, juicy pieces, revealing a tender interior with a glossy, flavorful crust. Drizzle any extra glaze over the slices for added shine and flavor.