
Few cuts of beef command the table quite like filet mignon, and this version delivers that steakhouse experience entirely from your own kitchen. The method is classic and precise — a screaming-hot cast iron sear followed by a quick oven roast — which builds a deep, caramelized crust while keeping the center buttery and tender. What really elevates the whole thing is the herb butter made with ghee, fresh parsley, thyme, rosemary, and a hint of lemon zest, which melts luxuriously over the hot steak the moment it hits the plate. Using ghee instead of conventional butter keeps this firmly in paleo territory without sacrificing any of the richness you'd expect from a high-end steakhouse finish. Avocado oil handles the high-heat sear beautifully, and the seasoning stays clean and simple so the quality of the beef stays front and center. This is the kind of recipe that feels genuinely celebratory but relies on straightforward technique and a short ingredient list — no complicated prep, no pork-derived ingredients to navigate around, just exceptional beef done right.
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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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