This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
Put into a saucepan one pint of Allemande Sauce to which has been added two tablespoonfuls of truffle essence and ham essence.
Reduce, and stir until the sauce is sufficiently stiff to coat immersed solids thickly.
 
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