The Book of Household Management by Mrs. Beeton

stock. _Mode_.--Supposing that by some accident the soup is not quite clear, and that its quantity is 2 quarts, take the whites of 2 eggs, carefully separated from their yolks, whisk them well together with the water, and add gradually the 2 quarts of boiling stock, still whisking. Place the soup on the fire, and when boiling and well skimmed, whisk the eggs with it till nearly boiling again; then draw it from the fire, and let it settle, until the whites of the eggs become separated. Pass through a fine cloth, and the soup should be clear. _Note_.--The rule is, that all clear soups should be of a light straw colour, and should not savour too strongly of the meat; and that all white or brown thick soups should have no more consistency than will enable them to adhere slightly to the spoon when hot. All _purées_ should be somewhat thicker. ALMOND SOUP.