While phở is Hanoi’s most iconic noodle soup, there are many others worthy of your attention. One such example is bún thang (pronounced “boon taang”), a rice vermicelli noodle soup known for being light yet filling and savory. In the Vietnamese capital, you’ll find nearly a dozen restaurants hawking this noodle soup. Our favorite is this over 20-year-old standby near the scenic Hoàn Kiếm Lake, where bowls start at just VND50,000, or roughly two dollars. Often considered to be a medicinal dish—that is, a chicken noodle soup-esque dish that one…