Remove the ham from refrigeration 1-2 hours before cooking to allow it to come to room temperature.
Preheat your oven to 325°F (165°C).
Place the ham cut-side down in a large roasting pan and cover loosely with foil. Add 1/4 cup of water to the bottom of the roasting pan.
In a medium saucepan, combine the brown sugar, maple syrup, Dijon mustard, apple cider vinegar, cinnamon, cloves, nutmeg, melted butter, and pineapple juice (if using). Heat over medium-low heat, stirring constantly until the sugar dissolves completely and the mixture is smooth and slightly thickened, about 3-5 minutes.
Place the foil-covered ham in the preheated oven. Bake for about 1 hour and 30 minutes, or until the internal temperature reaches 100-110°F (38-43°C).
Remove the ham from the oven and increase the oven temperature to 400°F (200°C). Discard the foil covering.
Using a pastry brush, generously coat the entire surface of the ham with about 1/3 of the brown sugar glaze, working it between the slices as well.
Return the glazed ham to the oven, uncovered, and bake for 15 minutes.
Remove and apply another 1/3 of the glaze. Return to oven for another 15 minutes.
Apply the remaining glaze and bake for a final 15 minutes until the glaze is caramelized and slightly crispy at the edges.
Remove from the oven and let the ham rest for 15 minutes before slicing and serving.