Preparation materials: lettuce, light soy sauce, salt, sugar.

Step 1. Peel the lettuce, wash and drain.

Step 2. Cut into strips.

Step 3. Put it in a container and marinate. Press something on top to squeeze out the water and marinate for 12 hours.

Step 4: Take it out and bask in the sun.

Step 5. Add sugar to the pot.

Step 6. Add light soy sauce and bring to a boil.

Step 7. Put the lettuce into the bottle.

Step 8. After the boiled light soy sauce has cooled down, pour it into a bottle, close the lid and you can eat it at any time.