Put beef and pork in large pot with garlic, onions, salt and pepper, mace, cloves and nutmeg. Cook thoroughly until done.
Take out all heavy ingredients. Add oatmeal to water in which meat and onions were cooked, adding more water if necessary. Cook and stir constantly until oatmeal absorbs the water and becomes thick.
Put beef, pork and onions through food chopper. Mix thoroughly with oatmeal and pour into pans 2" deep. Place in refrigerator.