The breast is pounded and combined with a teaspoon of ground rice, an egg yolk, salt, pepper and a small amount of nutmeg. After running the mixture through a sieve, quenelles are formed and combined with the stock to make a soup.
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.