This French onion soup is a symphony of deeply caramelized onions in a rich, savory broth, topped with a crusty crouton and melted Gruyère cheese. The slow-cooked onions achieve a jammy sweetness that is perfectly balanced by the robust beef broth and a splash of sherry, delivering a luxurious, soul-warming experience in every spoonful.
Storage: Refrigerate leftover soup (minus the croutons and cheese) in an airtight container for up to 4 days. Freeze the soup base (without bread or cheese) for up to 3 months; thaw overnight in the fridge. Reheating: Reheat the soup gently on the stovetop over medium-low heat, stirring occasionally, until piping hot. For the gratinée, reassemble with fresh bread and cheese, then broil as directed — the bread will not be as good if it has been frozen. Do not microwave the assembled soup, as the bread will become soggy.
Keywords: French onion soup, Gordon Ramsay French onion soup, classic French onion soup, caramelized onion soup, beef broth soup, Gruyère cheese soup, winter soup, comfort food, onion soup with croutons, stove top soup