Cook shallot onions in a pot on medium heat for about 30 minutes.
Add pepper, salt, and sugar, and continue caramelizing for another 15-20 minutes.
Melt in butter, then add dry white wine and cook until Jammy.
Stir in flour, beef broth, Worcestershire sauce, fresh thyme, bay leaves, and dry sherry. Simmer for 15-20 minutes.
Bake French baguette and mix Gruyère with Parmesan.
Ladle soup into bowls, top with bread and cheese mixture, and melt the cheese.
Serve and enjoy!
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