
With a sharp knife, score the surface of the ham in a diamond pattern. This makes for an attractive presentation, and it will allow the glaze to penetrate the meat. If you are glazing the ham, you might want to score it.This temperature also applies to hams that come from places that are not USDA inspected.
Leftover cooked ham-as with other leftovers-must be reheated to a temperature of at least 165 F.Heat the ham on LOW for approximately 8 to 10 hours, or until the temperature reaches 140 F for a "fully cooked" ham or 145 F for a "cook before eating" ham. If you have a large enough slow cooker, put the ham in it and add about 1 cup of ginger ale, cola, stock, or water.
If the ham is labeled "cook before eating," heat in an oven set no lower than 325 F to an internal temperature of at least 145 F. Wrap the ham tightly with the foil and bake at 300 F for about 15 minutes per pound, or until a meat thermometer registers 140 F when inserted into the thickest part of the meat, not touching bone. To heat a spiral-sliced ham, place it on a sheet of heavy-duty foil, cut-side down. If the ham is labeled "fully cooked" (does not require heating), heat it in the oven for about 10 minutes per pound, or to an internal temperature of 140 F. Place the ham on a rack in a large baking pan and add about 1/4- to 1/2-inch of water to the pan. It should be labeled either "fully cooked" or "cook before eating."
Check the label for cooking instructions.