Wash the duck and pat dry. Rub inside and outside with salt and pepper. Close the opening and tie up. Tie wings and leg likewise. Roast on the grill above the fat pan in a preheated oven (electric range: 200 °C / gas: level 3) for approx. 1 1/2 hours.
In the meantime, for the sauce, wash the chicken giblets and pat them dry. Clean, wash and roughly dice the soup greens. Fry the chicken giblets and soup vegetables in 2 tablespoons of hot oil. Add tomato paste and sweat.
Season with bay leaves, peppercorns and sage. Deglaze with white wine and stock, let it boil for about 1 hour in an open pot. Pour through a sieve, stir in cream and season again. For the vegetables, clean and quarter the savoy cabbage and remove the stalk.
Cut the savoy cabbage into fine strips. Blanch briefly in boiling salted water and drain. Peel the carrots, leave some green, wash, cook for about 5 minutes in boiling salted water and drain.
Peel and chop the onion. Cut the bacon into fine cubes. Wash and chop the herbs. Just before serving, leave the bacon out until crispy. Add onion, carrots and fat. Swivel the savoy cabbage in it. Add vinegar, salt, pepper, nutmeg and chopped herbs.
Steam the savoy cabbage briefly. Arrange vegetables and carved duck garnished with herbs on a plate. Serve with extra sauce.