1. Preparation materials: pork 400g, beef 400g, egg 1, onion, thirteen spices, oyster sauce, salt, sugar and soy sauce.

2. Wash and slice pork and beef and put them in a basin.

3. Shred the onion and put it into the meat together.

4. Beat in an egg and add oyster sauce, two spoonfuls of cooking wine and soy sauce.

5. Add thirteen spices, salt and sugar.

6. Wear plastic gloves, knead well and marinate for 35 minutes.