This section is from the book "The White Ribbon Cook Book", by Kathryn Armstrong. Also available from Amazon: The White Ribbon Cook Book.
Rub a saucepan with a shallot, melt a piece of butter in it, add a very small quantity of flour and the trimmings of the truffles chopped coarsely; moisten with some good stock free from fat, and season with pepper, salt and the least piece of nutmeg. Let the sauce simmer about 10 minutes, and it is ready.
Remove the outer skin from a number of chestnuts (carefully excluding any that may be the least tainted), put them to boil in salted water with a handful of coriander seeds, and a couple of bay leaves. When thoroughly done, remove the outer skin, and pound the chestnuts in a mortar, adding a little stock (free from fat) now and then. When a smooth paste is obtained, fry an onion in butter to a light color, add the chestnut paste and sufficient stock to get the sauce of the desired consistency; add salt and pepper to taste, pass through a hair sieve, and serve.
 
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