
Place all ingredients except oil in a food processor. Whizz until parsley is finely chopped, but not pureed.
Transfer into a small bowl. Add oil, gently stir. Set aside for 1 hour before use, overnight is even better.
Take steak out of the fridge 30 minutes prior to cooking.
Heat BBQ or heavy based skillet with 1 tbsp vegetable or canola oil over high heat until smoking.
Sprinkle each side of steak generously with salt and pepper.
Add steak and cook to your liking.
Transfer to a plate, cover loosely with foil and rest for 5 - 10 minutes.
Cut thin slices against the grain and serve with Chimichurri Sauce on the side.