In a large bowl, whisk together the olive oil, red wine vinegar, chopped parsley, minced garlic, paprika, ground cumin, dried oregano, red pepper flakes, salt, and black pepper.
Add the flank or skirt steak to the marinade, making sure that it is fully coated. Cover the bowl with plastic wrap and marinate the steak in the refrigerator for at least 1 hour or up to 24 hours.
Preheat a grill or grill pan to medium-high heat. Remove the steak from the marinade and shake off any excess. Discard the remaining marinade.
Grill the steak for 4-5 minutes per side, or until it is cooked to your desired level of doneness.
Let the steak rest for 5-10 minutes before slicing it against the grain into thin strips.
Serve the spiced steak hot with chimichurri sauce and your favorite side dishes.
Notes
Tips and Tricks
Make sure to fully coat the steak with the marinade to ensure the flavors penetrate the meat.Don't overcook the steak to ensure it stays tender and juicy.Let the steak rest for a few minutes before slicing to allow the juices to redistribute.