"The classic French onion soup you crave is just like the one from the restaurant, full of beefy broth and topped with a slice of toasted French bread and 2 kinds of cheese. Red wine adds an authentic flavor...."
INGREDIENTS
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1/2 cup butter
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8 onions, sliced
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2 cloves garlic, crushed
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1/2 teaspoon salt, or to taste
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1/2 teaspoon ground black pepper, or to taste
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1 teaspoon dried thyme
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1 cup red wine
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1 tablespoon sherry
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2 tablespoons all-purpose flour
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2 quarts beef broth
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1 French baguette, cut into 1/2-inch thick slices
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olive oil, or as needed
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6 slices Swiss cheese
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6 slices provolone cheese