Mix all of your marinade ingredients together, then add your steak. Coat the steak thoroughly in the marinade and leave out at room temperature to rest for an hour.
Pre heat your BBQ when the steak has 15 mins left to marinate.
Spray a little olive oil directly onto the steak before placing them onto the grill section of the BBQ. Close the lid if you have one, let it cook for around 3 mins. Then spray with oil and flip over to cook for a further 3 mins.
If your steaks are quite large, after their second side has cooked for 3 minutes move them onto the solid flat side of your BBQ, turn down the heat to low, cover and cook until they are cooked to your liking. **
Remove and rest for 5 mins before serving with your choice of sides.