1. Slaughter the soft-shelled turtle with hot water, cut it open, remove the internal organs, remove the dirt and wash it;

2. Peel the yam, wash and cut into pieces;

3. Add a proper amount of water, ginger, onion, cooking wine and salt to the casserole, and add Rhizoma Drynariae, Fructus Lycii, Rhizoma Dioscoreae and soft-shelled turtle to stew together.