INGREDIENTS
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6 tablespoons butter
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4 large yellow onions, sliced and separated into rings
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1 tablespoon white sugar
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2 cloves garlic, minced
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½ cup cooking sherry
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7 cups beef broth
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1 teaspoon sea salt, or to taste
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¼ teaspoon dried thyme
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1 bay leaf
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french bread, optional
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provolone cheese, optional