Via: Kitchen Swagger
Pan sear filet mignon in a cast iron skillet once and you will NEVER grill it again, I promise. I wish I discovered this method a lot sooner, it’s simple enough and locks in all of the favors. There are plenty of ways to cook filet mignon but this is by far my favorite. If you go out to a nice steakhouse then this is most likely the method they are using to cook your filet. High heat and real butter.
See full article and recipe HERE