Take the ribeye steaks out of the fridge about 20 minutes before cooking. This helps them cook evenly on the grill. Pat them dry with paper towels, then season generously with salt and black pepper on both sides.
In a bowl or food processor, combine parsley, garlic, lime juice, vinegar, and red pepper flakes. Slowly mix in olive oil until the sauce reaches a slightly loose consistency. Taste and adjust seasoning, then let it sit so flavors can develop.
Heat your grill to high and create two zones—one for direct heat and one cooler side. This setup helps control flare-ups and prevents burning. Lightly oil the grill grates to keep the steak from sticking.
Place the steaks on the hot side of the grill and cook for about 4–5 minutes per side. Flip occasionally to get a nice crust without overcooking. Aim for an internal temperature of around 130–135°F for medium-rare.
Remove the steak from the grill and let it rest for about 5–10 minutes. This allows the juices to redistribute, keeping the meat tender and juicy. Cutting too early can cause the juices to run out.
Slice the steak against the grain for maximum tenderness. Spoon generous amounts of chimichurri sauce over the top or serve it on the side. Enjoy immediately while warm and flavorful.