Heat the butter, sauté the leek, celeriac and carrots for approx. 3 mins., pour in the stock, add the bay leaves, bring to the boil, reduce the heat, cover and simmer the soup for approx. 2 mins. Add the pasta and continue to simmer for approx. 7 mins. Add the cabbage, cook for a further 3 mins., season. Serve the Buuretopf in warmed soup bowls. Top with the shaved Sbrinz and parsley.