Pho Bo (Vietnamese Beef Noodle Soup)

Gloomy weather again today. And since I was already buying beef marrow bones for Borscht, I decided to make pho bo (Vietnamese beef noodle soup). (The ? accent over the O in phở makes it sound like a question, so to pronounce it properly, say phở as if you were asking a question. Remember phở is your friend, not foe so don't pronounce it that way. :P)  Pho originated in north Vietnam, but