Combine beef and ham, with milk and eggs, onion, bread crumbs, salt, allspice and pepper. Shape into meatballs about 5 cm in diameter. (If desired meatballs may be smaller). Carefully arrange meatballs in Crockpot. Cover and cook on Low 2- half to 3- half hours.
Turn control to High. Stir in flour that has been dissolved in quarter c water. Add ketchup and dill weed. Cook on High for 15 to 20 minutes or until slightly thickened. Turn heat off, stir in sour cream.