
Filet mignon is already one of the most naturally clean cuts of beef you can buy, and this preparation keeps it that way from start to finish — no cured meats, no processed seasonings, no hidden additives to worry about. The real star alongside the steak is a compound butter made with ghee, fresh parsley, thyme, rosemary, garlic, and a hint of lemon zest, which melts into a glossy, fragrant pool right at the table. Searing in a cast iron skillet over high heat builds that deep, caramelized crust that makes a great filet unforgettable, and finishing in a hot oven brings the center to a perfect medium-rare without overcooking the edges. Resting the steaks before serving is a small step that makes a big difference, letting the juices redistribute so every slice is tender and rich. Because every ingredient here is whole and unprocessed, you get a restaurant-quality result without any of the label-reading stress that comes with store-bought marinades or seasoning blends. This is the kind of meal that feels genuinely special but comes together with straightforward technique and a short ingredient list.
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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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