There is no one milk soup (zupa mleczna). Thta is a blanket term for hot witner soups containign milk and... it can be rice, barley,rolled ats, muillet flakes, pasta, egg-batter noodles, etc. In my family raisins were not added, but why not. Milk soups can be served salty or sweet. A pat of butter may be added to the hot soup. There is no recipe, just a rough guideline: per serving cp,bome 1.5 cups milk and 1/2 - 3/4 c of any of the abve in saucepan, add 172 t salt, bring to boil stirrign constantly, reduce heat to low, cover and let simmer 5 min.