Step 1: Preheat your oven to 325 degrees Fahrenheit. Step 2: Remove the ham from its packaging and pat it dry with paper towels. Step 3: Score the fat on the top of the ham in a diamond pattern, being careful not to cut too deep into the meat. Step 4: Place the ham in a roasting pan, bone-side down, and add about an inch of water to the pan. Step 5: Cover the pan tightly with foil and place it in the preheated oven.