A rich, savory and satisfying soup recipe, with caramelized red onions and savory seasonings simmered in a beefy broth. The pièce de résistance? Ooey, gooey melted Swiss and Parmesan cheese. Make the soup ahead and be ready for a quick supper. Just reheat and top with the toasted French bread and cheese.
* Or melt cheese on French bread slices and place on top of hot soup.
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