Prepare your hot coals or a good barbeque grill. Bring to high temperature.
In a cup, mix the white wine, EV olive oil and lemon juice.
Add a generous amount of salt & pepper. Mix well.
Place the steak on the fire and cook each side for 2 minutes.
With the rosemary sprig, brush both sides of the steak with wine mix.
Cook for an additional 5-6 minutes.
Slice and serve.