"It's topped with melty gruyère and a crispy crouton. ????..."
INGREDIENTS
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1/2 c. salted butter
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4 large (or 6 medium) yellow onions (3 to 3 1/2 lbs.), thinly sliced
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1 c. white wine
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1 qt. low-sodium chicken broth
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1 qt. beef broth
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1 1/2 tsp. Worcestershire sauce
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2 cloves garlic, chopped
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1 tsp. kosher salt
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1/2 tsp. black pepper
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6 thick slices of french bread or baguette
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6 oz. gruyère cheese, grated