My mother in law used to fix this all the time for her family. It was handed down from a Yugoslavian family. My wife used to fix it but when I retired I started cooking for the two of us. So I fix it now. We both love it.
Chop bacon and fry not crispy, fry onions till translucent, fry garlic but don't burn, then fry cabbage.
Mix flour, water, egg and some garlic salt if you wish till you have a sticky dough. Boil a big pot of water, break small pieces like lumps into boiling water. When they float they are done. Mix these lumps with cabbage, bacon, onions, garlic and your done.