Like most hams, spiral hams come fully cooked and ready to eat while they are still cold. For those who prefer to eat hams that are warm or hot, ham producers recommend heating spiral hams for 15 minutes per pound at 275 degrees Fahrenheit. This means that heating a 10-pound spiral ham should take around 2 hours and 30 minutes.
As its name implies, spiral ham is a type of ham that comes precut in thin, spiral slices. The founder of HoneyBaked Ham, Harry J. Hoenselaar, invented the slicing machine and patented it in 1952. HoneyBaked Ham used to be the only brand that offers spiral cut ham. The spiral cutting technology, however, became available for other ham producers after Hoenselaar's patent for the slicing machine expired in 1981.
Spiral hams are available in quarter, half and whole ham sizes. Quarter hams weigh around 3 to 4 1/2 pounds, half hams about 7 to 8 pounds and whole hams 14 to 18 pounds.
To heat a half spiral ham, place the ham in a shallow roasting pan with the flat or face side facing down and bake it in an oven preheated to 275 degrees Fahrenheit for approximately 2 hours. It is important to keep the ham from overcooking and coming out dry.