Using sharp knife, lightly score the steak about 1/8 inch deep on both sides in a crisscross pattern at 1/2-inch intervals.
In a small bowl combine the cumin, garlic powder, oregano, freshly ground pepper and kosher salt. Season both sides of the steak with season spices.
For the chimichurri, mix all ingredients together. (Note: this tastes best when you chop everything by hand rather than in a food processor)
Prepare the grill on high heat. Grill the steaks to desired doneness, about 3 to 4 minutes per side for medium-rare, turning steaks 1/4 turn after 1 1/2 minutes to form crisscross grill marks, if desired.
Transfer steaks to cutting board; let rest 5 minutes. Thinly slice steaks across grain.
Transfer to platter and top with chimichurri sauce.
Notes
*For more authentic chimichurri omit the onion and add 2 more garlic cloves.Here's my original less authentic version I previously used, both taste delish but since so many of you asked for it, here it is:Original Chimichurri Sauce:
2 tbsp packed fresh parsley, finely chopped (no stems)
2 tbsp packed tbsp chopped cilantro
2 tbsp red onion, finely chopped
1 clove garlic, minced
2 tbsp extra virgin olive oil
2 tbsp apple cider vinegar
1 tbsp water
1/4 tsp kosher salt
1/8 tsp fresh black pepper
1/8 tsp crushed red pepper flakes, or more to taste