Jook is the Cantonese word for congee/rice porridge/rice gruel. Obviously it tastes better than that sounds. I mean, 'gruel?' Eww.
Jook is prepared by boiling cooked rice in a lot of water for a long time until it starts to disintegrate. Other ingredients may be added if you like. It's actually a breakfast staple and excellent when you're sick.
What else are you thinking about?