Shareable size! The cut from the tenderloin is a lot bigger than the Filet Mignon and usually weighs between 1 and 1.2 lbs. – which is enough for at least two. As the legend goes, it is named after the French aristocrat François-René de Chateaubriand whose chef invented a specific cooking method for the fillet. Otto’s grilled Chateaubriand recipe shows you how to prepare this fancy steak on the Otto Grill.