1. Preheat the oven to 160°C.
2. Score the surface of the ham in a diamond pattern about 1/8-inch deep. Place cloves in the middle of each diamond. Bake the ham for 2 to 2/12 hours, or longer, depending on the package directions.
3. Heat the brown sugar, mustard, vinegar and soda in a small saucepan until bubbly. Cook until thick, about 15 minutes.
4. After 2 hours of baking time, brush the glaze on the ham in 20 minutes intervals until it's nice and glossy.