Method:
Bring water to a boil with salt. Add cabbage leaves. Boil uncovered 5 minutes or until just soft. Drain leaves, reserving liquid, and set both aside to cool. In a small bowl, mix chopped sausage, ground beef, cooked rice, egg, salt and pepper until just combined (do not overmix). Shape into loose 2-inch egg shapes and roll each in the center of a cabbage leaf. Set aside.
Shred any remaining cabbage leaves. Mix shredded cabbage with sauerkraut and onion. In a very large heavy pot, place a layer of the shredded cabbage mixture on the bottom and cover with half the rolls, repeat layering, ending with shredded cabbage mixture on top. Add parsley and bay leaf. Pour tomato sauce over the top and add enough reserved cooking water to just cover cabbage. Place lid firmly on pot and bring to a boil. Lower heat and barely simmer 1 1/2 to 2 hours. Adjust seasoning and serve sprinkled with additional parsley, if desired.