I'm in the habit of buying new foods, googling them, and figuring out what to do.
I bought an herb called kayan. Google thinks it's cayenne or a youth basketball player named Kayan Herb. Nothing helpful!
It looks vaguely like tarragon, but with a shorter leaf. Tastes sweet and citrusy. It's yummy.
The store I bought it at is owned by Koreans but caters to every possible immigrant group, so it could from anywhere...