
Few things feel as indulgent as a perfectly seared filet mignon, and this version delivers that steakhouse experience right in your own kitchen. A screaming-hot cast iron skillet builds a deep, caramelous crust on the outside while a quick oven finish keeps the center tender and rosy — no guesswork, just technique. The real star is the herb butter made with softened ghee, fresh parsley, thyme, rosemary, garlic, and a hint of lemon zest, which melts luxuriously over the hot steak the moment it hits the plate. Ghee steps in beautifully here, bringing that rich, buttery flavor while keeping the whole dish grain-free and completely egg-free without any substitutions or workarounds. Avocado oil handles the high-heat sear without smoking out your kitchen, and the combination of kosher salt, freshly ground pepper, and flaky sea salt means every layer of the steak is properly seasoned. Letting the steaks rest before adding that herb butter is the small step that makes a big difference — it locks in the juices so every bite is as good as the last. This is the kind of recipe that makes a quiet weeknight feel like a genuine occasion.
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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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