INGREDIENTS
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4 large onions, sliced
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2 tablespoons butter
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1 teaspoon sugar
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2 quarts beef broth, no sodium added
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1/4 cup sherry
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2 sprigs fresh thyme
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1 1/2 teaspoons salt
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Pepper to taste
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1 cup croutons, plain
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8 ounces Gruyere cheese, sliced (can substitute with Swiss)