Beef tenderloin in a creamy green peppercorn sauce is an elegant Italian restaurant classic. This high protein mediterranean dish is a keto-friendly carnivore family dinner for special occasions.
Pat beef tenderloin steaks dry and season generously with kosher salt and freshly ground black pepper on both sides.
Heat olive oil and butter over medium-high heat in a heavy skillet. When butter sizzles, add steaks and sear for 3-4 minutes per side for medium-rare, adjusting timing by steak thickness.
Remove steaks and set aside tented with foil; turn heat to medium-low. Add green peppercorns and gently crush them in the skillet, stirring to release their aroma.
Deglaze the pan by carefully adding cognac or brandy, scraping any browned bits with a wooden spoon. Reduce briefly, then stir in heavy cream and simmer until sauce thickens, about 2–3 minutes.
Return steaks to the pan and spoon sauce over. Warm gently for 1 minute, then serve immediately with extra sauce spooned on top.