Ingredients: Clear soup, butter, flour, Parmesan, eggs.
Make a roux by frying two ounces of butter and two ounces of flour, add an ounce of grated cheese and half a cup of good stock. Mix up well so as to form a paste, and then take it off the fire and add the yolks of four eggs, mix again and form the again and form the paste into little quenelles. Boil these in a little soup, strain off, put them into the tureen and pour a good clear soup over them.
See also: Wikipedia Cookbook.
Source: ''The Cook's Decameron: A Study In Taste, Containing Over Two Hundred Recipes For Italian Dishes'' from a project that puts out-of-copyright texts into the public domain. This is from a *very* old source, and reflects the cooking at the turn of the last century. Update as necessary.