Bring a large pot of water to a boil. Boil cabbage leaves 2 minutes and drain. Let sit to cool down so it won't be too hot to handle.
In a large bowl, combine 1 C cooked rice, egg, milk, onion, ground beef, salt, and pepper.
Place about 1/4 C of meat mixture in center of each cabbage leaf and roll up, tucking in the ends. Use toothpicks if necessary. Place rolls in slow cooker.
In a small bowl, mix together tomato sauce, brown sugar, lemon juice, and Worcestershire sauce.
Pour over cabbage rolls. Cover and cook on Low 8 to 9 hours.
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