Bake the ham in the preheated oven, uncovered, for 2 1/2 to 3 hours or until a meat thermometer inserted into the thickest portion registers 140°, basting every 30 minutes with 1/2 cup of the glaze. Let the glazed ham stand 10 minutes before slicing and serving. If you’re going to cook a ham, chances are you’re going to go the classic route of doing it in the oven. Spoon on top of ham. Our food and drink editor, Sam Slaughter, shows us exactly how to cook a ham in the oven. Preheat oven to 325º. Cover with foil and bake until warmed throughout, 2 1/2 to 3 hours. Place ham on a roasting rack set in a roasting pan and diagonally score. Pour into a dish so it doesn’t continue to cook. This is a QUICK process and you need to move fast so it doesn’t get to thick. I have a few other ways to cook ham. Want to make a dutch oven ham, or try cooking it 3 other ways other than these? Remove the ham from the oven and spoon the pan drippings over it. Then serve on the side or pour over ham and enjoy.