It’s a common vegetable in Asian countries. When the root is cut, you will see many holes, usually eight or nine. It changes colour quickly when it’s cut and the internal flesh is exposed to the air. In order to prevent the oxidization, sliced or cut lotus root is soaked in vinegar water or water immediately. If you don’t use it immediately, wrap the root tightly to avoid exposure to the air, and store in a refrigerator. It will last a month or so.