To cook the perfect steak mignon using cast iron, follow these steps:
Choose a high-quality steak mignon that is at least 2 inches thick. Remove it from the refrigerator and let it sit at room temperature for about 30 minutes before cooking.
Preheat your cast iron skillet over medium-high heat for about 5 minutes. You want the skillet to be very hot before adding the steak.
While the skillet is heating, season the steak generously with salt and pepper on both sides.
Add a tablespoon of high smoke point oil, such as vegetable oil or canola oil, to the skillet. Swirl the oil around to coat the bottom of the skillet.
Add the steak to the skillet and sear it for about 2-3 minutes on each side. You want to develop a nice crust on the steak.
After searing, reduce the heat to medium and continue to cook the steak, flipping it every minute, until it reaches your desired doneness. Use a meat thermometer to check the internal temperature: 120-130°F for rare, 130-140°F for medium-rare, 140-150°F for medium, 150-160°F for medium-well, and 160°F and above for well-done.
Remove the steak from the skillet and let it rest for at least 5 minutes before slicing and serving. This allows the juices to redistribute and the steak to become more tender.
Optionally, you can add some herbs or butter to the skillet and baste the steak with the mixture during the cooking process for added flavor.
Enjoy your perfectly cooked steak mignon!