1. Put bay leaves, peppercorns, salt, rock sugar and rice vinegar in the pot, cook on low heat until the rock sugar melts
2. After filtering, add boiled water, mix well and let cool
3. Lettuce peeled and cut into strips
4. Carrot slices
5. Cucumber slices
6. Put the vegetable strips into a fresh-keeping bowl, pour in the vinegar sauce, and soak in a sealed container for 1 night.