From David In Israel: How Freeze Drying Works
James: I am sure the readers are interested in the way that industrial produced freeze dried foods are made. I was a kashrut masgiach (kosher supervisor) at a major freeze dry producer in the United States before I emigrated to Israel. Mashgichim are flown all over the world to places where there is no Jewish community to certify the kosherness of foods for consumption by Jews. (The laws of kashrut are much too complex to describe here). The plant I certified had two major types of chamber one that was bus-sized and another that was the size of a minivan. …