This classic French pan sauce for thick boneless steaks like filet mignon is not seen much anymore, and that’s a pity because it’s a truly superb accompaniment to a well seared cut of tender beef. Tangy, slightly spicy and creamy, the sauce is also aromatic thanks to the kiss of brandy. As with all pan sauces, this one will taste best if it is made in the same pan used to sear the fillet—so that it can be enriched by the fond.
If you are using the same pan, only add the additional oil as is necessary. However, filet mignon and similar cuts are not particularly fatty so you’ll likely need to use the amount of oil as we suggest here