Make basic congee. Wash the rice in advance and then soak with clean water for 30 minutes. Mix with 1/2 tablespoon of vegetable cooking oil or sesame oil. Set aside for 15 minutes. You can freeze the rice in the previous day.Bring the water to a boiling in a pot and then add the soaked rice. Heat until boiling again and slow down the fire and continue cooking for 30 minutes. Then transfer half of the congee to a serving claypot.
Marinate beef slice with salt, ground white pepper, ginger and 1/2 teaspoon of cornstarch. Mix for half minute. Then place the beef slice in the congee.
Stir quickly to separate the beef slices as soon as possible. Continue cooking for 1 minute. Add salt and mix well. Turn off fire, add chopped lettuce, shredded ginger and white pepper.