We first had this dish in the Muslim Quarter in X'ian. For some reason I thought that was about the only place you could get this dish. However, the other day when we were in our favorite Noodle shop, we saw a girl with this dish. At first we did not recognize it, so we asked her what it was and then ordered some for us.
Yang rou pao mo is a rich "lamb" broth or soup with a special bread. The bread is eaten in the soup. At our favorite noodle shop you can also get a Beef version of this soup (Niu ruo pao mo). Yang rou is usually translated as lamb, but I think that most often it is mutton and not really lamb, sometimes it is actually goat meat.
This dish is our new favorite especially in this chilly weather.