Richard
All man made finishes are food safe when completely cured out, which usually takes 30 days or longer after putting on the last coat. One of the best safe finish to use for food is Mineral Oil. Do not use Peanut or Olive oil, it will turn rancid😱. It can be redone real easy by just putting on another coat. With the hard finish ( such as Poly or other types of finish) is when you use a medal utencil and break through the finished surface, you ingest the finish that you put on the piece and also when the surface is broken through the oils from the foods that placed in the piece get in under the surface, causing more of the finish to come off and produce odor (rancid), bacteria and possibly rot into the piece.😱
Gary🙂