So in Korea there is a fruit called a 유자 (yu-ja) and it is similar to a lemon.
A really really popular drink is 유자차 (yu-ja-cha) Yuja Tea!
You basically make a sort of jam out of the fruit and then when you're ready for tea you add a scoop to your cup and then add hot water!
It's used a lot to help sore throats and colds.
I didn't have yuja and you're able to use grapefruit, lemon, and orange as well so I tried to make some with orange!
It tasted pretty okay :D