Production: unhairing the duck, cleaning its internal organs, blanching it with boiling water, taking it out and putting it on a plate, adding a little onion, ginger and salt, steaming it in a drawer, deboning it, cutting it into two pieces, mixing it with chicken essence, egg white, corn flour, cooking wine and salt to make a paste, and then chopping walnuts and water chestnut and putting it into a paste. Put the wok on the fire, pour in peanut oil, add the duck and fry until cooked, take it out and cut it into pieces, and put it on a plate. Sprinkle some rapeseed powder and serve. Efficacy: Bushen Gu Jing. Warming lung, relieving asthma and moistening intestine. Suitable for cough due to kidney deficiency, impotence, constipation, and kidney deficiency without stranguria.