Clean, wash and cut the pointed cabbage lengthwise into 8-10 slices (approx. 1 cm thick). Bring the stock to the boil in a pot. Blanch the pointed cabbage slices in 3 portions for about 4 minutes. Carefully remove the slices with a skimmer, keep warm.
Clean, wash and cut the radishes into small cubes. Cut capers in half. Wash parsley and dab dry. Peel the leaves and cut into strips. Peel and finely dice the onion. Mix yoghurt with milk.
Stir in parsley, radishes, capers and onion. Season to taste with salt, pepper and sugar. Arrange approx. 4 slices of cabbage, drizzle radish dressing over each. Garnish with caper apples, sprinkle with pepper.