"You can still taste a little light in each cup."
Inspired by the Spirit World tea Uncle Iroh serves little Korra from the tea pot Avatar Wan carried Raava (the spirit of light) in before they merged to become the first Avatar. From 'The Legend of Korra' on Nickelodeon.
'That's right. This was your's long, long ago. When you were Avatar Wan you used it to carry the light spirit Raava around, until the two of you became one. You know, when you make tea in it, you can still taste a little light in each cup.'