Part of the name of this expensive boneless cut means "dainty" in French
However, you can use beef 
filet mignon and beef tenderloin steaks (cut from other parts of the tenderloin) ... 
You can buy pre-cut and it will be a bit more expensive but I usually buy whole... [DOC] [TLE] August 13: National Filet Mignon Day | Sacchef's Blog [PAR] Aug 13, 2010 ... "Filet mignon (French for "exquisite or dainty fillet") is a steak cut of beef ... or the 
fillet, from the French boneless meat (mignon meaning small as true ... to be the 
most tender cut of beef, and the most expensive.