Young cabbage is sweet and delicate, it is cooking fast. It is not likely to give a stomach problems as may an old cabbage, stewed for hours. In case of young cabbage soup I minimize the seasoning, to keep the taste natural.
For broth I used pork bones, which are really cheap. You can also buy pork chop with bone, use pork chop for Breaded pork cutlets and use bones for the soup. I remember my Grandma was using bones for soups, the reason were savings and her approach- not to throw away any food and have respect for food.
Traditionally ‘Zasmażka’ can be added to the soup to make it thicker and reach.