IMHO, one of the best bowls of Bun Bo Hue (BBH) in the city - lots of lemongrass, a rich broth, topped with beef brisket and pork sausage. Topping could use a little something something, but for how simple it is, doesn't get much better.
Pho Hoan Pasteur is always busy, and I can see why. Their Pho and Thai style noodle soup are also good picks!