Just remembered to post some praise for the bún bò Huế at Xinh Xinh. Without a doubt the best version you can get around here, at least out of the ~10 I've tried. Most places just put some chili oil on the pho broth, some don't even use the right kind of noodles. The broth at Xinh Xinh is ultra-rich and dense, salty, like gravy. In addition to the pig knuckle there's a good amount of thin sliced beef, which is also sometimes absent. There's also some kind of black sausage or other processed/sliced bouncy meat product. They use the right kind of noodles (and there are plenty) and mix them with lots of thin slices of what I think is cabbage (maybe banana flower?), for that traditional crunchy texture. There's a lot of fresh lemongrass on top that makes it ultra fragrant ,and lightens up the heavy salt/umami/cilantro/onion flavor of the soup. Highly recommend!
7 Beach St, Boston, MA 02111