I stayed at the Formosa Regent in Taipei a few years back and had beef noodle soup for the first time. It blew me away. The problem is that I have never found one to come even close to it. I have tried one of the places in the Richardson Greenville area and it had a watery broth and did not taste that great. Don't remember which one.
So anyway, where is the best beef noodle soup in the Dallas area?