Pound steaks to be ¼ inch thick, and sprinkle each side with salt, black pepper, and ⅛ teaspoon mustard; rub into the meat.
Melt margarine in a large skillet over medium-high heat. Fry 2 of the steaks for 2 minutes on each side, and transfer to a hot serving plate. Repeat with remaining 2 steaks.
Add lemon juice, chives, Worcestershire sauce, and remaining mustard to the pan, and bring to a boil. Return the steaks to the pan to heat through, and coat with sauce.
Recipe by Make Mine Gluten Free at https://www.makemineglutenfree.com/steak-diane/