Their actual first meeting in the Kyoshi Warriors AU!
Katara had her Oh moment before exchanging a word with Jian Li, and while she gets over it in time (or, at least, convinces herself that she's not embarrassed by her initial reaction to him) this quasi-interaction haunts her for the first couple of days of their stay in Kyoshi Island.
It's just not fair that the place is full of gorgeous people! Or that he's not only beautiful, but also kind and awkward and respectful and dorky and—oh, La—she's in trouble.