Wash the duck inside and out and pat dry. Squeeze 1 orange. Mix juice with honey, salt and cayenne pepper. Place the duck on a fat pan rinsed with cold water and bake in a preheated oven (electric range: 200 °C/ gas: level 3) for 10 minutes.
Remove the quills with tweezers and roast the duck for another 40-50 minutes. Brush the duck several times with the marinade in between. In the meantime, clean and wash the leek and cut it into larger pieces.
Peel the rest of the orange so that the white skin is completely removed. Cut the fruit into slices, halve large slices. Steam leek in hot oil while turning for about 15 minutes. Add orange slices, pour on the rest of the marinade and bring to the boil once.
Arrange the duck with the vegetables on a plate and sprinkle with the nuts. Garnish with parsley leaves.