Chicken soup is a Jewish favorite all over the world. Among East European Jews it had a ritual significance because it was served to a bride and groom to break their wedding-day fast. Jewish chicken soup has become symbolic of Jewish cooking. Amazingly, scientists have discovered that chicken soup really does help cure a cold, so it's not just an old wives' tale! Try to use larger, older fowls, since they have more flavor. Add the gizzard, neck, and heart to the soup whenever possible. Some Jewish cooks also add the feet (Romanian Jews consider the feet a delicacy!), which are believed to add flavor; just remove them before serving the soup. With modern poultry rearing, it is rare to find unhatched eggs inside a chicken, but if you do, they make a delicious addition to the soup. For kashrut purposes, unhatched eggs are considered meat, not pareve as are hatched eggs, so they must be koshered in the same way as meat. If the chicken in this recipe is to be eaten separately, you may find it tastier if you brown it first in a little chicken fat.