1. Combine sauce ingredients; set aside. In a skillet, cook beef and onion until meat is browned and onion is tender; remove from the heat and drain.
2. Leaving a 1-in. shell and the core intact, cut out and chop the inside of the cabbage. To beef, add 1 cup chopped cabbage, 1 cup sauce, rice, egg, salt and pepper; mix well. Spoon into cabbage shell.
3. Place 2 cups water, the remaining chopped cabbage and the remaining sauce in a Dutch oven; mix well. Carefully add stuffed cabbage, meat side up. Cover and bring to a boil. Reduce heat; cover and simmer 1-1/2 hours or until whole cabbage is tender. Remove cabbage to a serving platter and keep warm.
4. Combine the cornstarch and remaining water; add to Dutch oven. Bring to a boil, stirring constantly; boil for 2 minutes. Pour over the cabbage; sprinkle with Parmesan cheese. Cut into wedges to serve. Yield: 8 servings.