Mix the breadcrumbs, cream and water; set aside for 5 minutes.
Work together the beef, pork, salt, allspice and onion. Gradually add the breadcrumbs, then the egg. Blend well and fry a sample to test the seasoning.
Shape into balls. Heat part of the margarine or butter in a skillet. When the foam subsides, add 10 to 15 meatballs. Cook over moderate heat until the meatballs are beautifully brown and cooked through.
Transfer to a serving dish and keep hot while cooking the remaining meatballs. Serve with lingonberry preserve.