INGREDIENTS
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4 pounds yellow onions, peeled and chopped
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•10 cups beef broth
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•1 baguette, sliced diagonally and toasted
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•1 bay leaf
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•1 1/2 cups Gruyere or swiss cheese, grated
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•1/2 cup (1 stick) unsalted butter, melted
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•1/4 cup all-purpose flour
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•2 tablespoons extra-virgin olive oil
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•2 tablespoons balsamic vinegar
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•1 tablespoon Worcestershire sauce
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•kosher salt and freshly ground pepper, to taste