There are several types of finishes that can be used on items such as utensils, counter tops or butcher blocks that would be considered food-grade. Some examples would be walnut oil, mineral oil and paraffin wax. There are more, but these seemed to be the most suitable for the purpose stated.
A wood surface that is protected with a substance such as food-grade mineral oil or an application of parafin wax that food may be prepared or served on without altering the food and making it unsafe for consumption. Common examples of such surfaces include wood cutting boards, butcher block countertops and wood salad bowls.