Trim the ham if necessary and position it in a slow cooker. Mix the melted butter and honey together, then rub the mixture over the surface of the ham, working some between the slices. Cover and cook on the LOW setting for 4–5 hours.

As the cooking time concludes, preheat the broiler to HIGH and line a roasting pan with heavy-duty aluminum foil.

In a small bowl, combine the granulated sugar, seasoned salt, onion powder, cinnamon, nutmeg, ginger, cloves, paprika, and allspice. Spread half of this sugar mixture evenly over the top of the ham.

Broil the ham for several minutes until the sugar glaze bubbles and becomes caramelized. Remove from the oven.

Transfer the remaining sugar mixture to a small saucepan. Add 3 tablespoons of either water or ham juices from the slow cooker (a mix of water/ham juice and bourbon also works well). Stir and bring the mixture to a boil. Allow it to boil for approximately one minute before removing from heat.

Brush or pour the prepared glaze over the ham, then broil once more for 1–2 minutes, ensuring it does not burn. Take the ham out of the oven and let it rest for 5–10 minutes before serving.

Serve warm or chilled, and enjoy!