The recipe may not be entirely to modern tastes. Besides eggs, lemon juice and sugar, it calls for a few grains of ambergris, a substance secreted from the digestive system of a sperm whale.
http://bit.ly/1sQQRgj
http://bit.ly/1sQQRgj+
For information about joining, leaving and suspending mail (eg during a holiday) see the list website at https://www.jiscmail.ac.uk/cgi-bin/webadmin?A0=archives-nra