Make sure your steaks sit out at room temperature for about 30 minutes.
Heat a cast iron skillet over medium-high heat - you want it hot! Season the steaks on both sides with the salt and pepper.
Add 2 tablespoons of butter to the hot skillet. It will sizzle and smoke and once it’s all melted, add in the steaks. Cook for 3 minute, until deeply golden, then flip and cook for 3 minutes more. Add in the remaining butter. Once it melts, spoon it over top of the steaks for another 1 to 2 minutes. I like to cook the steaks to about 140-145 degrees (almost medium doneness or medium well). Remove the steaks and let them rest for 10 to 15 minutes before slicing.
truffle herb fries in the air fryer
Place the sliced potatoes in a large bowl and cover with cold water. Let the potatoes sit in the water for 30 to 60 minutes. Remove the potatoes and place them on kitchen towels - you want them completely dry! Pat them as dry as you can!
Preheat your air fryer to 375 degrees F. Place the potatoes on a baking sheet and spray or brush with olive oil. Place the fries in a single layer in your air fryer (you might have to do 2 batches!). Cook for 12 minutes, then gently flip the fries and cook for 5 to 6 minutes more.
Stir together the parsley and parmesan cheese. When the fries are done, place them on a plate or a sheet of parchment paper and sprinkle all over with the truffle salt immediately. Sprinkle with the herbs and parmesan mixture. Serve with the aioli. If you do 2 batches, or if the fries are done before the steak, you can stick these in a 200 degree F oven until ready to eat!