Heat your oven to 325° F.
With a sharp knife score the ham with diagonal lines about 1/8- to 1/4-inch deep into the fat to achieve a diamond pattern.
Place the ham fat side up in a shallow roasting pan and bake 30 minutes.
Combine together brown sugar, maple syrup and mustard whisking until well combined. Brush the ham with the mixture and return to oven.
Bake an additional 30 minutes and then brush with again with remaining sugar mixture. Continue to bake for approximately 15 to 20 minutes longer or until a meat thermometer reaches 140° F.
Remove ham from oven and allow to rest 15 to 20 minutes on a wire rack. Slice and serve.Servings: 12