The reverse searing method is a cooking technique used to cook steaks, including filet mignon, that involves cooking the steak at a low temperature in the oven until it reaches the desired internal temperature and then searing it on high heat in a hot pan for a short period of time to achieve a crispy crust. The reverse searing method is often used for thicker cuts of steak because it helps to ensure that the inside of the steak remains juicy and tender, while the outside is seared to perfection.