This section is from the book "The Epicurean", by Charles Ranhofer. Also available from Amazon: The Epicurean, a Complete Treatise of Analytical and Practical Studies on the Culinary Art.
Throw into boiling, salted water, two pounds of medium-sized peas, and boil them for ten minutes with a little piece of mint; drain them, then put four ounces of butter into a saucepan. and when warm, throw in the peas, and let them fry for a few minutes; moisten with white broth, adding a few lettuce leaves, about four ounces, and two ounces of onions; the lettuce to be cut up fine, and the onions minced; season with salt, sugar, and nutmeg, and boil until the peas are thoroughly cooked, then drain, suppress the mint, and mash them in a mortar, moistening them with two and a half quarts of white broth. Press through a sieve or tammy, and return them to the saucepan with a pint of veloute (No. 415); should the puree be too thick, then add more broth; warm it well without boiling, and thicken the soup with egg-yolks, cream and butter, (No. 175). Pour the soup into a soup tureen with some chopped up chervil, and a garnishing of extra fine peas.
Parboil two pounds of shelled green peas until partly cooked; then drain and put them on to fry with half a pound of fresh butter; moisten with white broth and add half a pound of minced white onions. When the peas are entirely cooked drain and pound them, diluting with veloute and the same broth they were cooked in; rub the whole through a tammy and return to the saucepan; put it on the fire and heat without boiling. Just when prepared to serve, thicken with egg-yolks, butter, and cream, adding a few mint leaves finely chopped and as garnishing some small chicken quenelles made with half chicken queuelle forcemeat, and half cream forcemeat laid through a pocket on a buttered baking tin.
 
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