To make the chicken soup, soak the soybeans in cold water overnight and the next day strain and place in an unperforated cooking bowl and add 1 liter of water. Steam the soybeans in a steamer for 90 minutes at universal cooking 100°C.
Peel and coarsely dice the carrots, leeks and onion and add to the soup along with the chicken drumsticks and spices. Then add 3 liters of sake (Chinese rice wine) or water.
Now steam the whole soup for 3 hours at universal cooking 100°C and enjoy!