Season both sides of steak with salt and pepper.
Melt 2 tbsp. butter in a heavy skillet; add steaks and cook approximately 4 minutes on each side for medium-rare; about 2 minutes longer per side for medium. Remove steaks to serving plate and keep warm.
Add into pan drippings, mustard and shallots. Sauté over medium heat 1 minute. Then add 2 tbsp. butter, lemon juice, Worcestershire sauce and chives.
Cook for 2 minutes. Add brandy and beef broth; pour sauce over steaks. Sprinkle remaining scallions over the top.
by The Savvy Kitchen