The practice is to wash Agrocybe aegerita with salt water, soak Cordyceps sinensis in warm water (although it is also called this), and buy Achilles tendon for beef, which is not easy to cook (this thing needs to be pricked with a needle to help it become brittle). Pour the washed Agrocybe aegerita Cordyceps into the soup pot, and simmer for about 40 minutes, then pour the achilles tendon and cook for 1 hour. If it is too long, the beef will be very old.