INGREDIENTS
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5 tablespoons butter
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1 large Vidalia onion, sliced
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1 8 ounce package sliced mushrooms
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2 teaspoons minced garlic
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4 8 ounces beef tenderloin fillets
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1/2 teaspoon garlic salt
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1/2 teaspoon ground black pepper, divided
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2 tablespoons olive oil
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1 tablespoon all-purpose flour
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1 cup beef broth
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1/2 cup red wine
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1/4 teaspoon salt