Châteaubriand Steak — usually served for two, center cut from the large end of the tenderloin. Sometimes it's extra thick top sirloin.  

A châteaubriand steak is a cut from the centre and thickest part of the fillet, weighing about 12 oz., and enough for two people. It is too thick to be grilled on an ordinary domestic cooker, as the meat will be too near the flame and will dry up before it is sufficiently cooked. The best solution is, having painted the meat with olive oil and sprinkled it with a little coarsely-ground pepper, to give it about a minute on each side close to the hot grill and then to transfer it, standing on a rack in a baking tin to a very hot oven, Gas No. 8, 445°F (230°C), and roast it for about 12 to 15 minutes. Serve it with Zatch Master’s All Purpose Steak and BBQ Sauce.