Sprinkle steaks with pepper and salt. In a skillet melt 2 tablespoons butter. Stir in onions and mustard; cook for 1 minute. Add steaks; cook for 2 minutes on each side or until the meat reaches desired doneness. Remove to a serving platter and keep warm. Add lemon juice, Worcestershire sauce and remaining butter to skillet; cook for 2 minutes. Add parsley and chives. Pour over steaks.
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