
Few cuts of beef feel as special as filet mignon, and this version delivers a steakhouse-worthy experience entirely from your own kitchen. A screaming-hot cast iron skillet builds a deep, caramelized crust on the outside while a quick oven finish keeps the center perfectly tender and rosy. The real star is the herb butter — softened ghee whipped together with fresh parsley, thyme, rosemary, garlic, and a hint of lemon zest — which melts luxuriously over the hot steak the moment it hits the plate. Because ghee replaces the dairy butter found in most classic preparations, this fits cleanly within a paleo framework without sacrificing any of that rich, indulgent finish. There's no sweetener of any kind hiding in the marinade or the sauce, so you get pure, savory flavor from start to finish — no label-reading required. Letting the steaks rest before serving is a small but crucial step that locks in the juices and lets that herb butter do its slow, gorgeous melt. Whether you're cooking for a special occasion or just treating yourself on a weeknight, this is the kind of meal that feels genuinely impressive with surprisingly little effort.
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Preheat the oven to 425°F (220°C). Remove the steaks from the refrigerator 20–30 minutes before cooking and pat them completely dry with paper towels. Season all sides evenly with the kosher salt and black pepper.
In a small bowl, combine the softened ghee, parsley, thyme, rosemary, garlic, flaky sea salt, and lemon zest, if using. Stir until evenly mixed, then set aside at room temperature.
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