INGREDIENTS
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3 tbsp butter
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2 large (jumbo) yellow onions, sliced into rings
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1/2 tbsp white sugar
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1/4 cup cooking sherry
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6 cups reduced-sodium beef broth
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1/2 tsp seasoning salt, or to taste
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1/4 teaspoon dried thyme
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French bread
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Shredded Parmesan cheese
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Shredded Mozzarella cheese