Take ham out of refrigerator, completely unwrap packaging and discard. If there is a piece of plastic over the end of the bone (bone guard), discard.
Let ham sit on counter for 1-1 1/2 hours in a heavy baking pan before baking.
Thirty minutes before baking, place rack on lower 1/3 of oven and turn oven to 275 degrees.
When ready to bake, place 1/2 cup water in bottom of pan, cover ham with foil and tightly seal edges of foil to pan.
Bake for 10 minutes per pound.
Gather glaze ingredients while ham is baking, whisk together in a pan and cook over low heat until sugar is dissolved or the glaze is bubbly (about 3-5 minutes). Set aside until ready to brush onto ham.
When ham is heated, remove ham from oven and turn heat to 400 degrees.
Remove foil from ham and discard any liquid left in pan by spooning out or using a bulb baster.
Brush or spoon glaze over ham and return to oven for 10-15 minutes or just until glaze is bubbling a bit. When removed from oven, brush additional glaze on ham.
Notes
Before discarding packaging, look to see how many total pounds of ham in package, so you can bake accordingly.
The ham may be cooked either cut side down, or with the cut side exposed. If cooking on the side, use toothpicks to help keep end piece from separating and drying out. Remove toothpicks before serving.
Important to remember the ham is already cooked, you are simply warming the ham and glazing before serving.