Preheat the oven to 325 degrees F. Coat a large baking pan with cooking spray.
Add the butter, brown sugar, honey, orange juice, mustard, cinnamon and nutmeg to a pot. Place the pot over medium heat.
Bring the pot to a simmer and cook for 5-7 minutes, stirring occasionally, or until glaze looks syrupy and has just started to thicken.
Place the ham in the prepared pan and pour half of the glaze over it. Cover the ham with foil. Reserve the remaining glaze for later use.
Bake the ham for 2 1/2 hours. Remove from the oven and uncover the ham.
Pour the remaining glaze over the ham. If the glaze has started to harden, you can microwave it for about 30 seconds to loosen it back up.
Increase the oven temperature to 400 degrees F.
Place the ham, uncovered, in the oven. Bake for another 15 minutes or until glaze is caramelized and browned.
Transfer the ham to a serving platter and garnish with fresh herbs and fruit if desired. Spoon pan drippings over the ham. Slice the ham, then serve and enjoy.