For the goose soup, cook the goose meat in the salt and vinegar water flavored with bay leaf and peppercorns for about 1 hour until tender, adding the root vegetables during the last 20 minutes.
Remove the gosling from the soup with a ladle, scoop it out and cut it into small pieces. Set the root vegetables aside.
Prepare a light roux with goose lard and flour, pour in the goose stock and whipping cream, and simmer the soup, stirring occasionally, until it becomes creamy.
Season to taste with nutmeg and then strain through a hair sieve. Meanwhile, prepare the breadcrumbs by creaming the butter and mixing it with yolks, egg, parsley, salt, pepper and the breadcrumbs soaked in water.
Then add enough breadcrumbs to make a compact mass. Form small dumplings, coat in flour, egg and breadcrumbs and fry in hot fat.
Serve the finished dumplings together with finely chopped goose giblets and finely chopped root vegetables in the hot soup.