INGREDIENTS
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8 ounces sliced mushrooms
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3/4 to 1 cup sliced onion
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6 tablespoons butter, divided
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1/4 cup flour
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1 teaspoon salt
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1/4 teaspoon ground black pepper
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1 to 1 1/2 pounds round steak, about 1/2-inch thick, cut into very thin strips
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1 1/4 cups beef broth
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1 tablespoon Worcestershire sauce
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2 tablespoons flour
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1 cup sour cream