The Polish have a name for these as Hallupkies. I steam the cabbage, so you can remove the leafs easier. I stuff with rice and hamburger. Separate the leafs and put the hamburger/rice mixture in each leaft and roll them up. You actually have to fold the leaf and then roll it up so that the meat mixture stays in the leaf. I put them in a large pot and put some water mixed with a small can of tomato sauce. If you don't have tomato sauce you can use some ketup with water. I put a lid on them and cook until done. My mother does the same but puts only tomato sauce in them and a lot more of it as it was a soup etc. When I make it this way whatever is left for the broth, etc. is a good base for vegetable soup.