Add soy sauce to the chicken stock and bring to a boil. Reduce heat to medium and pour beaten eggs in a slow, thin stream from a height of at least 10" above the pot while stirring briskly with the other hand. The egg noodles are done in 30 sec. Add a garnish and serve immediately. Good garnishes include parsley, sauteed mushrooms (prepared in advance) and fr ozen green peas which will de-frost in the heat of the bowl but stay fresh - not overcooked.