Method

To make the chimichurri sauce:

1. Mash the garlic in a mortar and pestle until broken up into a rough paste.

2. Add the cilantro, parsley, thyme, and oregano and continue mashing until the herbs are coarsely ground.

3. Mash in the red chile flakes, then the lemon zest and vinegar.Slowly drizzle in the oil while mixing.

4. Season the chimichurri sauce to taste with salt and pepper and reserve.

To grill the steaks:

1. Prepare the barbecue for medium-high heat or preheat an indoor grill pan over medium-high heat.
2. Sprinkle the steaks with salt and pepper on each side.
3. Set the steaks on the grill, fat side down.
4. Grill until some of the fat is rendered and golden brown - about 3 to 4 minutes.
5. Lay the steaks on the grill and cook to desired doneness - about 3 to 4 minutes on each side for medium-rare.
6. Transfer the steaks to plates and rest for 4 minutes.
7. Spoon the chimichurri sauce over and around the steaks and serve.