Beef tenderloin is widely regarded as the most tender cut of beef. It's a portion of the ever-popular T-bone or porterhouse steak, and the upscale filet mignon comes from it as well.
The tenderloin is a lean cut with comparatively little intramuscular fat, known in culinary terms as marbling. And marbling happens to be one of the major factors in making a cut of beef moist and flavorful.
How to Cook Beef Tenderloin
Cook a tenderloin quickly over high heat (like on the grill) so that the exterior becomes nicely browned while leaving the interior juicy and medium-rare. You can also sear it in a smoking hot skillet on the stovetop, then finish it in a 450 F oven.