Arrange the roast duck to be cut into edible pieces - choose the nicer pieces out (to use as decoration later). Take out the skin or fats of the remaining pieces of duck.
Boil a pot of water. Once the water is boil, put in the pieces of duck (those w/o skin) into the pot and boil for about 10 minutes. Reason is to "wash" again the fats that can be found on the meat.
Take out the pieces of meat and rinse till clean.
Use a bigger pot, boil the 2 lliter water with the herbs, sugar canes, red dates and duck pieces. Once it is boiling, transfer to a slow cooker and simmer for about 2-3 hours.
Blach the noodles in boiling water. Arrange the required amount of noodles in a bowl. Add in the herbal duck soup and duck pieces. Garnish with chopped spring onions.