http://durgan.org/2017/December%202017/1%20December%202017%20Soup/HTML/ 1 December 2017 Soup
Soup was made in a double boiler from vegetables dehydrated and powdered and stored in a vacuum pack also jars, when they were in season. The dehydrated produce keeps for long periods at room temperature, and retain most of their nutrients. It is a convenient method of storing in a small space. They are reconstituted quickly in water in the double boiler without burning, making a nourishing soup.