Preheat smoker to 225 degrees. Season both sides of steaks then place directly on grill. Close lid and let smoke for 40 minutes.
Meanwhile, make chimichurri sauce by placing olive oil, vinegar, cilantro, parsley, onion, garlic, red pepper flakes, salt and pepper in a blender or food processor. Pulse until everything is combined and not big chunks remain (I don't like mine perfectly smooth). Pour into a bowl and set aside (no need to refrigerate right away).
After 40 minutes of smoking is up, increase heat on smoker to high and cook for another 4-6 minutes. Then flip steaks and cook to desired temperature and doneness. Remove from smoker and let steaks rest for 5 minutes.
Serve steaks with chimichurri on the side or right on top.
Notes
If you prefer your steak more rare, decrease smoke time to 30 minutes then grill on high for less time. I highly recommend using a digital meat thermometer to get your steak perfectly cooked!
This steak is amazing sliced and added to a salad with the chimichurri drizzled over the top.
Don't have a smoker? It's ok! Just use whatever grill you have and cook the steaks to your liking. Top with that amazing sauce and it will be perfect!