Combine remaining tomato sauce with ½ cup of cabbage water. Whisk to incorporate everything. Pour over top of cabbage rolls.Note: You could stir in about a tablespoon or so of white or brown sugar into the tomato sauce if you want less of a tomato bite. I like the brightness of tomatoes, so I skip this.
Top with more cabbage leaves. Cover casserole dish tightly with foil. Cover and bake about 2 hours and 15 minutes to 2 hours 30 minutes.
Once done, be careful removing foil covering as there will be steam. Discard top cabbage leaves. Allow to cool for 20 minutes or so before digging in. Garnish, if desired.
Enjoy !