INGREDIENTS
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1 very large onion, about 1 1/2 pounds, halved thinly sliced
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5 tablespoons butter
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1/2 teaspoon sugar
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1 teaspoon salt
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1/4 teaspoon pepper
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3 tablespoon flour
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1 teaspoon fresh thyme leaves, minced
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3 1/2 cups broth (chicken, beef or vegetable)
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6 slices white baguette
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1 1/2 cup Gruyere + Provolone cheese, grated