2. Wash lotus seeds, melon seeds, coix seed and candied dates, and soak them in advance except candied dates.
3. Wash and peel the wax gourd, but don't peel it. The skin of winter melon has obvious effect of promoting water. Boiled winter melon skin is also delicious. Cut the wax gourd into large pieces.
4. Remove the skin of the old duck, so that the boiled soup is not so fat and cut into large pieces.
5. After the water in the pot is boiled, put the duck in the boiling water to remove the bloody smell and floating foam.
6. Add water to the casserole and add duck meat, ginger slices and candied dates. After the water is boiled, add the soaked lotus seeds, Zhao Shi and Coix seed to prevent the bottom from sticking.
7. Add the wax gourd pieces, cover the pot, simmer for an hour and a half, and finally add salt to taste.