In a Dutch oven, cook cabbage in boiling water for 10 minutes or until outer leaves are tender; drain. Rinse in cold water; drain. Remove 8 large outer leaves (refrigerate remaining cabbage for another use); set aside. , In a large saucepan, saute 1 cup onion in butter until tender. Add the tomatoes, garlic, brown sugar and 1/2 teaspoon salt. Simmer for 15 minutes, stirring occasionally. , Meanwhile, in a large bowl, combine the rice, ketchup, Worcestershire sauce, pepper and remaining onion and salt. Crumble beef and sausage over mixture and mix well. , Remove thick vein from cabbage leaves for easier rolling. Place about 1/2 cup meat mixture on each leaf; fold in sides. Starting at an unfolded edge, roll up leaf to completely enclose filling. Place seam side down in a skillet. Top with the sauce. , Cover and cook over medium-low heat for 1 hour. Add V8 juice if desired. Reduce heat to low; cook 20 minutes longer or until rolls are heated through and a thermometer inserted in the filling reads 160°.