Add steak, seal bag and let sit in refrigerator for about an hour.
Turn bag occasionally.
Heat grill to high and spray grates with nonstick spray.
Drain marinade from steak and season with salt and pepper.
Place on grill and cover.
Cook, turning once until desired doneness- probably about 6 minutes per side, or longer (best to test with an instant-read thermometer to find out the temperature inside the steak- 145 degrees for medium rare & 160 degrees for medium.)