What is u-dong?

U-dong is a type of Korean noodle dish that is commonly served in a hot broth. The noodles are made from wheat and potato starch, and can vary in thickness and texture. The broth is typically made with beef or anchovy broth, and can be spiced with chili flakes and other seasonings. U-dong is often garnished with vegetables like green onions and carrots, as well as bits of beef or seafood. It is a popular comfort food in Korea and is often eaten in the colder months.