Pork and Shiitake Mushroom Bun Stuffing Recipe First, stir the beef into the stuffing, then. Add water and mix thoroughly. After that, the shiitake mushrooms are put into hot water to blanch for a while, and then after passing them in cool water. Chop into mince. Add the beef with soy sauce, soy sauce oil, chicken essence, cooking wine. Mix the ginger and green onion together, and finally add the chopped mushrooms. Then stir clockwise in one direction.