2. Put the bird's nest in a container, add purified water, change water halfway, soak for 6-8 hours, pick out feathers, tear them into strips, remove impurities, clean and filter them, put them in a waterproof stew pot, add purified water, and the bird's nest will not pass.
3. Add water to the saucepan and start stewing. Set the stewing time for 40 minutes. Add rock sugar in the last 5 minutes and stew until the rock sugar melts and the bird's nest is soft and waxy.