1. Put the beef shank in cooking wine, salt, pepper, ginger, star anise, cinnamon, grass fruit, and sana, and marinate for half an hour.
2. Put the marinated beef with marinated ingredients into a casserole and add soy sauce.
3. Set the casserole on fire and light it.
4. After the water is boiled, skim off the foam and simmer for 2 hours.
5. Use chopsticks to gently insert the meat, which means it is cooked. Turn off the heat and wait for the soup to cool for a while before removing the beef. This will keep the beef from drying out.
6. Take out the beef and let cool. Slice and serve.
7. Cool beef.
8. Beef cut into slices.
