떡국 (rice cake soup) is eaten commonly in Korea on New Year's Day. It's made obviously with rice cake, but many other vegetables go into it too.
And there are several types of 떡국 you can get. The one I try today is made with 만두 (dumplings), and has beef in it. This type of 떡국 is called 떡만두국 (rice cake and dumplings soup).
Give it a try if you can (it doesn't even have to be New Year's Day) and check out my video about it here to learn more.