If youd like to be on or off, please FR mail me.
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Actually I believe the origin lies with Sephardic traders in the Carribean, who found a was to boost exports of both cocoa and sugar. The technique itself "exported" to European Jews, where there were Jews in Europe. I've read of the low countries, and the technique spreading to the Swiss, though not sure if there were Jews there. First I'd heard of France.
An 18th century ad from New York.
Granted, the book is written by a Cadbury, and for all practical purposes, starts in the early 1800s, but it has been touching on all sorts of inputs and outputs that the chocolate biz was part of back then.