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French onion soup is the ultimate exercise in patience paying off. The magic is all in the caramelized onions — 35 to 45 minutes of slow cooking transforms them from sharp and pungent into something impossibly sweet and jammy, and that concentrated sweetness becomes the backbone of the entire soup. Rich beef broth, a splash of white wine, and a hint of thyme do the rest. The iconic finish is a thick crouton blanketed in broiled Gruyère cheese that forms a golden, gooey crust over the bowl.