Chinese yam contains a large amount of starch,proteins,mucilage, etc.,which gives it a sticky feeling.It is best to boil the water and add a little salt,and drop a few drops of vinegar,then quickly put the cleaned and sliced Chinese yam into the boiling water for about 50 seconds before removing it immediately.Then immerse it in cold water; this method makes the Chinese yam crisp and delicious, without any stickiness.