This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
If intended for poultry, add one-fifth pint of mushroom liquor and eight ounces of button-mushroom heads turned or channeled and cooked, to one pint of very stiff Allemande Sauce.
If it be intended for fish, take one pint of fish veloute thickened with the yolks of four eggs, and finish it with mushroom liquor, as above.
 
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