This section is from the book "The Post-Graduate Cookery Book", by Adolphe Meyer. Also available from Amazon: The Post-Graduate Cookery Book.
Blend 4 hard-boiled egg yolks with 2 gills of thickly reduced tomato sauce; add the butter and rub through a fine sieve.
Scrape a good-sized horseradish very fine, pound, add 8 ounces of butter and juice of I lemon ; rub through a sieve.
Add curry and chutney to the butter, and rub through a fine sieve.
Blanch a handful each of parsley, tarragon, chervil, burnet, chives and spinach; press well to extract all humidity and pound in the mortar with 6 hard-boiled yolks of eggs, 4 anchovies, 3 or 4 gherkins, and a small handful of capers; add 8 ounces of butter, season with salt, cayenne and a dash of tarragon vinegar, then rub through a fine sieve.
Parboil (in a copper pan of boiling water) 3 sliced shallots and I handful each of spinach leaves, tarragon and chervil; drain and cool in cold water, press firmly and pound in the mortar with two boned anchovies, rub through a fine sieve and put aside until required.
This butter is often of great usefulness to the cook; the proportions are generally 1/2 each of butter and flour, but it is preferable to use a little less of the latter.
Mix well 6 ounces of butter with 4 ounces of flour, add to the boiling sauce or stock, but do not allow to boil afterwards, as the sauce is liable to flavor the flour.
Pick, wash, drain and drip a good handful of parsley. Put it in a frying basket and plunge in very hot fat; leave until quite crisp, then drain and keep hot until needed.

 
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