This is our favorite soup too!! I use canned mushrooms which is easier for me. I recently found a farmers market that sells..sauerkraut and they had sauerkraut juice so I bought several gallons of it. I also ask our local store manager to order it for me. FRANKS sauerkraut juice is made in Fremont, Ohio...might have to take a road trip to buy some. Who would think sauerkraut juice could make such a yummy soup??