Nga Rasatter from Saigon Nights shares her Pho recipe. 

Ingredients

2 lbs. 3 oz. Beef Bones
10½ Cup Water/beef stock (about 2 ½ cartons stock)
4 tsp. Fish Sauce
3 tsp. Sugar
2 tsp. Salt
6 TBS and 2 tsp. Garlic
6 TBS and 2 tsp. Ginger
5 pcs Star Anise
2 pcs Cinnamon Sticks (broken into pieces)
1/3 Cup and 4¼ tsp. Onion
1/3 Cup and 4¼ tsp. Carrot
1/2 lb. raw eye of round, sirloin, London broil or tri-tip steak, thinly sliced across the grain (1/16 inch thick; freeze for 15 minutes to make it easier to slice)

Additional instructions can be found here.