To buy: $15; amazon.com. To start caring for your cutting board, all you have to do is first wash it with hot soapy water and let it dry completely. Cover its surface with the Block Mystery Oil, let it sit overnight, then wipe away any excess oil with a cloth or paper towel. The brand recommends repeating this process once per month, or when you’ve noticed that your board is becoming dry and lighter in color. You can even take it a step further by sealing in the oil with the brand’s Mystery Cream—both of which are available in a set.