Cut vegetables: Cut napa cabbage and carrot and put them in a large bowl.
Add salt: Add salt, massage them and leave it for 10 minutes.
Remove the excess liquid: Squeeze the vegetables and drain.
Add seasonings: Add mayonnaise and vinegar, and toss them together.
Notes
Storage: Store in an airtight container and keeps it in the fridge. It will be good for 3 to 4 days. The liquid comes out the next day, and the taste gets diluted, so please add seasonings to tweak the taste.
Substitute: You can substitute napa cabbage with other types of cabbage. Cucumbers and paprika are also delicious to add. You can substitute rice vinegar with wine vinegar or apple cider vinegar.