Put all the ingredients into a medium freezer bag, including the steak.
Give it a good squidge to coat the meat entirely with the marinade.
Put the bag in the fridge for a couple of hours - or rather longer if you have time to think ahead - to allow the flavours to permeate into the steak.
Make sure the BBQ or pan are piping hot. Seal one side for 10 seconds, then turn and seal the other.
Once sealed cook, turning frequently, for 2 minutes for rare up to 5 minutes for well-done.
Cover to keep warm and allow to rest for a few minutes. Enjoy with your favourite vegetables or a fresh salad.