We sanded them to a smooth finish and purchased a food-safe mineral oil.
We rubbed them with mineral oil allow the oil to penetrate the wood a day or so between applications.
See the difference before and after the application of mineral oil?
*Mineral oil is food safe and brings out the gorgeous colors of the wood. After each use, wash with hot water and dry well, reapply mineral oil as needed. What a difference the oil makes and the boards will last longer.
These boards are pine and I have read conflicting reports on using pine for cutting boards, the only negative is that pine is softer and may not hold up to long-term use of knives. The positive is that pine can repel bacteria, not sure if either report is correct but at this price, I can replace these boards when needed and it will not break the bank!