
Few things feel as indulgent as a perfectly seared filet mignon finished with a pool of melting herb butter, and this recipe delivers exactly that kind of steakhouse magic at home. The technique is straightforward — a screaming-hot cast iron skillet builds a deep, caramelized crust, and a quick finish in a hot oven brings the center to a precise, rosy medium-rare. Avocado oil handles the high heat beautifully, while ghee stands in for conventional butter to keep things grain-free and paleo-compliant without sacrificing any richness. The herb butter itself is the real showstopper: softened ghee whipped together with fresh parsley, thyme, rosemary, garlic, and a hint of lemon zest creates something aromatic and luxurious that melts into every crevice of the steak. Every single ingredient here is naturally free of celery and celery derivatives, so there's no need to scrutinize labels or worry about sneaky seasonings hiding in a spice blend. Letting the steaks rest before that final spoonful of herb butter goes on is the small step that makes a genuinely big difference in juiciness. This is the kind of dinner that feels like a celebration, even 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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