This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
Make same as milk frosting, adding one and one-half squares of melted chocolate as soon as boiling-point is reached, and flavoring with one-eighth teaspoonful of cinnamon.
One-third cup of sugar, two-thirds cup of grated maple sugar, one cup of butter, two-thirds cup of cream.
Mix ingredients and boil thirteen minutes. Beat until of right consistency to spread.
 
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