Take your favorite root veges, turnips, beets, carrots, potatoes, whatever and roast until tender.
Put a very light (I mean very light) coating of pan searing flour on the meat and sear the tenderloin on all sides then put in oven for 8-10 minutes depending if you like rare or medium rare
While the meat is cooking put finely diced onion and garlic in the same pan you cooked the meat in and cook until tender, then take a cup and a half of your favorite red wine pour into the pan, this will deglaze the bottom of the pan and add a lot of flavor to the sauce. Cooked the wine, onions and garlic in on medium heat and reduce. The searing flour with thicken the wine sauce. Righr before you take the sauce off the burner put 2-3 pads of butter in the sauce and mix in well.
Let the meat rest for atleast 5 minutes cut on a diagonal, put on serving plate, pour some of the wine sauce over the top, put the rest is a gravy bowl. Serve with the roasted root veges and the extra sauce. ENJOY!
A meal fit for a King!!!