I have not tried this, I'm just passing it along. Search "Lost Art Press soap finish" for more hits over the past 10 years or so. I don't think I would use it for food contact pieces, the reasons should be self-apparent.
blog.lostartpress.com
My First Time Using Soap Finish: Notes & Warnings - Lost Art Press
One of my favorite stories is how the writers for “The Straight Dope” column sent a fake hand-lotion recipe to the “Hints from Heloise” column – mixing
blog.lostartpress.com