If you're familiar with Korean dramas, you may have seen it given as a get well dish for the characters or as comfort food (because that's how it is in real-life Korea!).
In its simplest form Juk is rice cooked in a large amount of water (to the ratio of rice) until the rice breaks down. The thickness and extent of rice-breakdown is dependent on preference. Because Juk is plain, it is often served as a side among more flavorful dishes, or can become a main dish by adding meat and other ingredients directly into the water and rice.
Note: Because Iroh made this for a sick Zuko, and because I made this for a sick self, the recipe below is for plain Juk, but you can make it savory or sweet by topping it with honey or sesame oil, seaweed or carrots, sesame seeds or soy sauce, anything you'd like! This rice porridge is a blank canvas! (See image at the end of this post for some topping ideas.)
Earth Kingdom Jook
1/2 Cup Uncooked White Rice
5 Cups Water
Salt & White Pepper, to taste (optional)
Pinch of Sugar (optional)
Toppings: Drizzle of Sesame Oil, Nori Furikake, Carrot Shreds, Green Onion.