This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
One cup of butter, three cups of confectioners' sugar, two tablespoonfuls of breakfast cocoa, coffee infusion.
Cream butter, and add sugar gradually, continuing the beating; then add cocoa and coffee infusion, drop by drop, until of right consistency to spread, or force through a pastry bag and tube.
 
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