Interesting. Hadn't heard of Yan Du Xian soup... the one I *have* heard of is congee, the thick chicken-broth-and-rice based soup that is both often a carrier for various medicines to be taken orally, and considered medicine in itself... Myself, I like either a hearty chicken noodle (with extra garlic), or matzoh ball soup, which when I make it is not just broth and balls and little else, but not dissimilar from the chicken noodle except I use all-Kosher (or as close as I can) ingredients when working with matzoh, because it wouldn't be right otherwise....

(It might sound funny to others that I would consider keeping as close to kosher as possible important, being a goy and all... but, as Tevya said, it's Tradition, and it's a thing for me to honour it...)