Bring A Large Pot Of Water To A Boil. Boil Cabbage Leaves 2 Minutes; Drain. In Large Bowl, Combine 1 Cup Cooked Rice, Egg, Milk, Onion, Ground Beef, Salt, And Pepper. Place About 1/4 Cup Of Meat Mixture In Center Of Each Cabbage Leaf, And Roll Up, Tucking In Ends. 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.