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What is a Papin Soup Digester?
The Papin Soup Digester is the predecessor to the modern pressure cooker. ( Early pressure cookers were also called "digesters".) This example is made of porcelain.
The Digester was named for its inventor, Denys Papin, a fellow of Royal Society in England, who described its abilities as transforming the "oldest & hardest cow beefàmade as tender as choice meat."