Preheat the Oven: Set the oven to 325°F (160°C). Grease a roasting pan and set it aside.

Prep the Ham:

Use a sharp knife to score the surface of the ham in a diamond pattern, about 1 inch apart and 1/4 inch deep.

Insert cloves in the center of each diamond for flavor and presentation.

(Optional) Brush with tamari soy sauce for an extra layer of savory flavor.

Bake the Ham:

Place the ham cut-side down in the prepared roasting pan. Cover loosely with foil and bake at 325°F for 22-26 minutes per pound, or until the internal temperature reaches 140°F (60°C).

Make the Glaze:

In a medium saucepan, combine brown sugar, mustard, cola, and vinegar (or bourbon).

Bring to a boil, then reduce heat and simmer for 20 minutes until thickened and darker in color.

Glaze the Ham:

Remove the ham from the oven and brush with 3/4 of the glaze.

Return the ham to the oven, uncovered, for an additional 20-25 minutes until the glaze is bubbly.

Serve:

Take the ham out of the oven, brush with the remaining glaze, and let rest for 10-15 minutes before carving.