Onion soup is a flavorful dish primarily made from onions, broth, and often topped with melted cheese and toasted bread. The onions are typically caramelized to enhance their sweetness, creating a rich base for the soup. It is commonly served hot and can be enjoyed as an appetizer or a main course. One of the most famous variations is French onion soup, which features a savory beef broth and is topped with Gruyère cheese. This classic dish is popular in many restaurants and is known for its comforting taste and aroma, making it a favorite during colder months.