Remove leaves from head of cabbage gently, trying to keep whole. Scald these in boiling salt water just to wilt a bit. Take and set these on paper towels to cool. Prepare meat mixture in a large bowl; add rice, onion, egg, salt and pepper; mix well. Place about 1/4 C. meat mixture in center of each leaf; fold in sides and roll ends over meat; secure with wooden toothpicks. Place in crockpot. Combine tomato soup, tomatoes, cinnamon, salt, and pepper; pour over cabbage rolls. Cover and cook on low for 7 to 9 hours.