
Few cuts of beef feel as special as filet mignon, and this version delivers a steakhouse-worthy experience right in your own kitchen. A screaming-hot cast iron skillet builds that deep, caramelized crust, while a quick finish in the oven brings the center to a perfect, rosy medium-rare without overcooking the edges. The real star, though, is the herb butter — softened ghee whipped together with fresh parsley, thyme, rosemary, garlic, and a hint of lemon zest that melts luxuriously over the hot steak the moment it hits the plate. Because the butter is made with ghee instead of dairy butter, it stays firmly in paleo territory without sacrificing any of that rich, indulgent finish you'd expect from a classic preparation. Every ingredient here is straightforward and naturally free from tree nuts, so there's no label-scanning or substitution stress involved — just clean, bold flavors doing exactly what they're supposed to do. Letting the steaks rest before serving is the one step you absolutely cannot skip, as it locks in the juices and lets the internal temperature settle to that ideal spot. Whether this is a weeknight treat or a proper celebration dinner, it's the kind of recipe that makes you wonder why you ever paid restaurant prices.
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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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