Clean the white cabbage, quarter it and cut out the stalk. Cut cabbage into thin strips, wash and drain. Bring vinegar, stock, salt, pepper and sugar to the boil, add oil. Knead hot marinade into the cabbage.
Cover and leave to stand for approx. 20 minutes. Quarter the peppers, clean and wash them and cut them into strips. Clean and wash spring onions and cut into wide rings. Radishes clean, wash and cut into fine slices.
Wash parsley, dab dry and chop. Cut pretzels in half once horizontally. Cover the bottom half of the pretzels with 1 slice of cheese and radish. Sprinkle with 1/3 of the parsley, place the upper halves of the pretzels on top.
Mix spring onions, paprika and the rest of parsley with the white cabbage. Season the salad with salt and pepper and serve with the pretzels.