This is how we make it at the restaurant... take a HUGE pot... fill it with chicken bones fill it with water, onion, carrot, celery, and ginger, boil it for 2 days. Keep on adding water to make sure it's totally fill to the top... after 2 day of cooking, remove all the fat and strain out the solid material left over. Now put the soup/stock that you have back on the stove and add around 20 cups of soy sauce and 20 cup of sugar, reduce it for 4 hours and it should be done.
