
Few dinners feel as indulgent as a perfectly seared filet mignon, and this version delivers a steakhouse-worthy result entirely from your own kitchen. The sear-to-oven method using a cast iron skillet builds a deep, caramelized crust on the outside while keeping the center buttery and tender — exactly what this cut deserves. The real star is the herb butter made with 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. Because ghee replaces conventional butter, the entire dish stays naturally free of gluten and dairy in the traditional sense, with no substitutions or specialty products required. Avocado oil handles the high-heat sear without burning, and every other ingredient is clean and straightforward, so there's nothing hidden to worry about. Resting the steaks after the oven ensures the juices redistribute properly, giving you that perfect rosy interior from edge to edge. This is the kind of recipe you pull out when you want to genuinely impress someone — or just treat yourself on a Tuesday night.
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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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