3-4 onions (thumb length), 3-4 ginger (1 yuan coin size), cold water duck rack, onion and ginger are put into the pot, without any other seasoning, water is poured on the two joints of the fingers of the duck rack, and boiled for half an hour on medium heat, and then an appropriate amount of salt chicken essence is put out. It is the purest duck soup, delicious and milky white.