INGREDIENTS
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2 Tablespoons olive oil
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8 cups thinly vertically sliced sweet onion
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½ teaspoon sugar
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½ teaspoon freshly ground black pepper
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¼ teaspoon salt
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⅓ cup dry white wine
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8 cups less-sodium beef broth
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¼ teaspoon chopped fresh thyme
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6 (1-ounce) slices French bread
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1½ cups coarsely grated Gruyere cheese