Bring you ham out of the refrigerator 30 minutes before you are going to cook it.

Preheat your oven to 325 degrees.  Oven the ham with the flat side down.  Now using a paring knife, score a crosshatch pattern around the ham.  Try to just pierce through the top layer.  The cuts will expand with the cooking process.

Line your roasting pan completely with foil.  You will thank me later for this one.  Place your roasting rack in your roasting pan.  Place the ham on the roasting pan flat side down.  Then pour some water into the bottom of the roasting pan, you want it about 1/4 inch deep.

Place ham in the oven and bake at 325 degrees  for 15 minutes per pound.

When ham has 15 minutes left with cooking mix together the glaze ingredients.  Place the brown sugar, mustard, orange zest, and orange juice in a bowl and mix together.

Remove the ham from the oven.  Increase the oven temperature to 425 degrees.  If there is no water in the bottom of the pan, add more.  Brush the entire ham with a coat of the glaze.  Once the oven has reached the 425 degrees, return the ham to the oven and cook for 15 minutes.

Remove the ham from the oven and bast with glaze again cook for 15 minutes.  Bast the ham with the glaze 1 more time and cook for 15 more minutes. Slice ham and serve.  if any glaze remains, you can microwave it until bubbly, about 15 -30 seconds, and drizzle over the ham sliced if desired.  (I highly recommend it) A 9-10 pound ham should serve 12.