Though you can follow this procedure with almost any tender cut of beef (and with chicken breasts, if that direction appeals to you), it's a perfect treatment for tenderloin medallions (filet mignon). (Photo: Craig Lee for The New York Times)
Jim s Easy Mushroom Sauce for Steak from Food.com: This is a rich, wonderful mushroom sauce my husband found. He made a steak dinner for me (and the kids) so I could enjoy watching the Oscars. This was my favorite part of the dinner! It's fantastic!