Peel and wash the carrots and cut them into long, wide strips with an asparagus peeler. Remove the outer white cabbage leaves. Cut out the stalk. Cut cabbage into wide strips. Peel and finely chop the onion.
Steam onion and prepared vegetables in hot fat for about 5 minutes. Deglaze with broth, bring to the boil and season with salt and pepper. Cook for another 7 minutes with the lid closed. In the meantime remove chicken fillets from the bone, wash and pat dry.
Heat the oil in a frying pan. Fry the fillets briefly on each side, season with salt and cayenne pepper. Fry for about 12 minutes at medium heat until done. Drain the vegetables and keep the stock.
Stir cream and flour until smooth. Stir into the stock and bring to the boil. Season to taste with salt, pepper and mustard. Serve the vegetables, chicken fillet and sauce sprinkled with pumpkin seeds and garnished with parsley.