If using a charcoal grill, prepare a bed of coals 4 - 6 inches under the grill grate.
Make the chimichurri by combining all the ingredients in a bowl or jar.
Season both sides of the steak with salt and pepper.
When coals have ashed over (white/gray), or your gas grill is ready with direct, high heat, oil the grates with a towel or brush.
Place on the steak and don't move it for 5 minutes.
Flip and repeat, cooking for another 5 minutes. When the temperature reaches 127-130°F, remove the steak to rest.
Rest for 10 minutes to allow the steak to come up to the 130-135°F range, and then slice and serve with chimichurri.
Notes
*You can cook ANY steak using this recipe. Please see the post above for specific cooking times, but on average most 1" thick steaks cook to mid-rare in 4-5 minutes on each side.