
Few meals feel as genuinely luxurious as a perfectly seared filet mignon, and this version delivers that steakhouse experience right in your own kitchen. The technique here is classic and precise — a screaming-hot cast iron sear followed by a quick oven finish — which gives you that deep, mahogany crust with a tender, rosy center every single time. What makes this dish stand out is the herb butter, a fragrant blend of ghee, fresh parsley, thyme, rosemary, garlic, and a hint of lemon zest that melts into the steak the moment it hits the plate. Using ghee instead of conventional butter keeps everything grain-free and dairy-casein-light while still delivering that rich, silky finish you'd expect from a high-end cut. Avocado oil handles the high-heat sear without smoking out your kitchen or introducing any unwanted flavors. The whole approach is refreshingly straightforward — no complicated sauces, no hard-to-source ingredients, just clean, quality components doing exactly what they're supposed to do. Whether you're cooking for a special occasion or just treating yourself on a Tuesday, this is the kind of recipe that makes you feel like you really know what you're doing.
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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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