step 1
Heat stock in a large pan. Add the onion, bouquet garni, mushrooms and beetroot. Boil for an hour
step 2
Strain the soup and stir the kwas into the clear soup. Add sugar to taste and reheat if necessary without boiling. Serve and enjoy.
step 3
You can add vegetables to the soup which is normally served during the Christmas Eve meatless dinner. Vegetables used are celery, carrot and parsnip, which are roughly chopped.