Guthuk is a traditional soup originating from Tibet. It's eaten only once a year, on the night of the 29th day of December, or the eve of Losar, Tibetan New Year. The soup is usually made with a combination of onions, garlic, ginger, tomatoes, celery, soy sauce, daikon, spinach, snow peas, shiitake mushrooms, scallions, and coriander.

It also contains rope noodles or small dough balls made from white flour and water. When served, each bowl has one large dough ball with a hidden item or symbol on the inside, which is a playful commentary on the person who receives it, such as salt (lazy), chili (sharp tongue), wool (kind-hearted person), or glass (happy-go-lucky).

The name of the soup is comprised of two words – gu, meaning nine (the soup traditionally has at least nine ingredients), and thuk, referring to noodle soups.