Use any convenience black pepper spice mix for coating the steaks, using 2 Tbsp. pepper mix for each pound of steak. Rub the pepper mix evenly onto both sides of steaks; cover and refrigerate up to 4 hours before grilling.
To grill a 1-1/2- to 2-lb. flank steak, grill on medium-high heat for 17 to 20 min. or until medium-rare doneness (135°F), turning occasionally.