Allow the steak to reach room temperature.

Preheat the barbecue.

Season both sides of the steak with salt and pepper.

Place the steak on the barbecue and cook for 3.5 minutes on each side. Follow the packet instructions and give the steak a ¾ turn halfway through cooking.

Let the steak rest for 5 minutes.

Slice the steak and serve it with the green sauce.