Brush steak with olive oil and season with salt and pepper.
Rub the surface of the grill pan with butter.
Place ribeye on a hot grill pan with tongs, pressing down for great grill marks. Cook on one side for 1 minute and 45 seconds, then rotate the steak 90 degrees. After 2 minutes, flip the steak and cook for an additional 1 minute and 45 seconds. Rotate 90 degrees and finish cooking for 2 minutes. Ensure the steak is cooked until its internal temperature reaches 145°F (63°C) on a meat thermometer for medium doneness, before removing from the grill.
Let steak rest for 7-10 minutes.
Add all the chimmichurri ingredients into a food processor and pulse until smooth.
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