Potage Printanier, Or Spring Soup
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Ingredients
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1/2 a pint of green peas, if in season, a little chervil, 2 shredded lettuces, 2 onions, a very small bunch of parsley, 2 oz. of butter, the yolks of 3 eggs, 1 pint of water, seasoning to taste, 2 quarts of stock No. 105.

Method
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Put in a very clean stewpan the chervil, lettuces, onions, parsley, and butter, to 1 pint of water, and let them simmer till tender. Season with salt and pepper; when done, strain off the vegetables, and put two-thirds of the liquor they were boiled in to the stock. Beat up the yolks of the eggs with the other third, give it a toss over the fire, and at the moment of serving, add this, with the vegetables which you strained off, to the soup.

Source: Mrs Beeton's Book of Household Management (1861)
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