INGREDIENTS
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3 tablespoon butter
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3 large onions, thinly sliced
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5 cups beef broth
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1 cup apple cider
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1/2 teaspoon black pepper
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1/2 cup grated Parmesan cheese
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1/3 cup dry red wine
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4 (1-inch) slices French bread, toasted
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1/2 cup shredded Swiss cheese