For the sauerkraut, peel onion and apple and cut into fine strips. Sauté onion in a pot with a little oil until translucent, add apple. Deglaze with white wine and a little water and steam until the onions are soft.
Carefully squeeze out the raw sauerkraut. Add the sauerkraut to the onions, top up with a little water and add the spices. Steam the sauerkraut until soft for about half an hour.
To thicken the juice, grate a potato and simmer for a few minutes.
Finally, season the sauerkraut with a little honey and salt.