How is "congee" prepared, and what are some common variations?

Congee, also known as rice porridge, is made by simmering rice in a large amount of water or broth until it breaks down into a thick, creamy consistency. It can be served plain or with a variety of savory or sweet toppings. Common savory toppings include pickled vegetables, preserved eggs, and sliced meat, while sweet variations might include ingredients like red bean paste or sugar. Congee is often enjoyed as a breakfast dish or comfort food.