In a small saucepan, combine 1 cup brown sugar, honey, cloves and mustards over medium heat, stirring until smooth.
Place ham in a baking dish. Brush the ham with the glaze. Spread the remaining ⅔ cup brown sugar over the top of the ham and press to adhere. Drizzle with more glaze.
Bake for 10 minutes per pound, re-glazing every 20 minutes. Tent with foil if ham begins to brown too much.