While the ham cools, prepare the dry rub. Whisk all of the dry rub ingredients together in a medium bowl. Pour half of the dry rub into a small saucepan (to be used for the serving glaze) and use the remaining half for the ham.
½ teaspoon table salt, 1 teaspoon ground nutmeg, 1 teaspoon ground cloves, 1 teaspoon ground cinnamon, ¾ teaspoon ground ginger, ½ teaspoon ground allspice, ½ teaspoon sweet paprika, 2 cups granulated sugar
After the ham has cooled for 15 minutes, uncover it and brush with the pan juices. Press the remaining dry rub all around the ham one handful at a time. Use all of the remaining dry rub. The sugar will eventually form a crust around the ham.
Once fully coated with dry rub, use a kitchen torch or broil in the oven to achieve the crunchy, crusty ham coating. If using the broiler, adjust the oven rack to the lowest position and watch the ham very closely, turning it often so it doesn’t burn. If using a kitchen torch, keep the torch flame about 1 inch away from the ham. Continuously move the flame in small circles until the surface becomes bubbly, then move the torch to the adjoining area until the entire ham has been caramelized. Before you know it, the entire ham will have a gorgeous, sugary, crispy coat.
Cover the ham very loosely with foil; set aside until ready to serve.
Make the serving glaze. Add the remaining pan juices to the dry rub mixture in the saucepan. Bring the glaze to a boil over medium heat, stirring often, and reduce the temperature to medium-low. Boil the mixture for 4-6 minutes or until it has reduced to a thin, syrupy consistency. Remove from the heat and serve alongside the ham. If the glaze begins to harden, just warm slightly over very low heat.
When ready to serve, divide the ham slices and drizzle the glaze on top.