Preheat the grill to 450°F to 500°F.
Pat the ribeye steaks dry with paper towels. Brush lightly with olive oil and season generously with salt and pepper.
Place the scallions on the grill and cook for 2 to 4 minutes, turning occasionally, until softened and charred in spots. Transfer to a cutting board and let cool slightly.
Place the ribeye steaks on the hot grill and close the lid. Cook for 5 to 7 minutes per side, flipping once, until deeply browned on the outside and cooked to your preferred doneness.
Transfer the steaks to a cutting board and let rest for 5 to 10 minutes.
While the steaks rest, finely chop the charred scallions. Add them to a bowl with the softened Challenge Salted Butter, lime juice, black pepper, and garlic, if using. Stir until well combined.
Spoon the charred scallion butter over the warm steaks. Slice, if desired, and serve immediately.
The temperature will continue to rise slightly as the steaks rest.
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