Remove 16 unblemished large outer leaves from cabbage. Cook leaves in boiling water 1 minute or until softened. Or, place head of cabbage in water. After 1 minute, drain. Remove 16 outer leaves from cabbage. Reserve remaining cabbage for another use. Drain softened leaves on paper towels.
In large bowl of electric mixer, combine beef, pork, breadcrumbs, onion, egg, salt, allspice, and milk. Beat with electric mixer on high speed until mixture is light and fluffy, about 10 minutes.
Divide meat mixture among cabbage leaves, placing an egg shaped mound near the stem end of each leaf. Roll into bundles, folding sides of cabbage leaves over meat mixture. Arrange cabbage rolls close together, in prepared baking pan, with loose end of leaf on bottom. Brush rolls with melted butter. Bake 1 hour.
Drain juices from pan into a large skillet. Over high heat, bring juices to a rolling boil; boil until reduced to make a shiny glaze. Slowly stir cream into glaze. Bring to a boil again. Stirring occasionally, cook until thickened. Arrange cooked cabbage rolls in a shallow bowl. Pour sauce over cabbage rolls. Serve hot. Makes 8 servings or 16 cabbage rolls.