Remove steaks from refrigerator, and season with pepper. Heat a large heavy skillet (I use cast iron) over medium heat until hot; add oil and butter. Increase heat to high; brown steaks about 1 minute on each side.
Reduce heat to medium; cook to desired degree of doneness. Transfer to a heated serving platter; season with salt and keep warm. Add shallots, garlic, and herbes to skillet; cook stirring, for 1 minute. Stir in red wine; cook, scraping up any brown bits from bottom of pan, until liquid has almost evaporated.
Stir in stock, mustard, and parsley; season with salt ans pepper to taste. Cook, stirring, until slightly reduced. Spoon sauce over steaks. Serve immediately.