Add the chicken, garlic, ginger, and 2 cups of broth to a small pot.
Bring this mixture to a boil, and turn the heat down to medium-low.
Gently simmer for one hour, stirring every 10 to 15 minutes. See notes below.
About 15 minutes before the soup is done, remove 1/3 cup of the hot broth from the pot. See notes below.
Crack the egg into the bowl, and slowly drizzle in the hot broth while constantly whisking.
When the soup is done, add the tempered egg to the pot when the soup is done, stirring constantly.