1. Prep the Steaks: First, gently flatten your steaks to an even 1-inch thickness using your hand or a meat mallet – no need to pound hard! Season both sides generously with salt and pepper.
2. Mix the Sauce Base: In a small glass measuring cup, whisk together the beef broth, Dijon mustard, and Worcestershire sauce. Set this flavorful mixture aside for a moment.
3. Sear to Perfection: Heat a medium-sized pan over medium-high heat. Add the butter or olive oil. Once the pan is nice and hot, carefully place your seasoned steaks and sear them for about 3 to 4 minutes on each side for a perfect medium-rare. Transfer the cooked steaks to a plate and let them rest, allowing the juices to redistribute.
4. Sauté Shallots & Deglaze: In the same pan, add the thinly sliced shallots and sauté them for about 2 minutes until they're tender and fragrant. Pour in the cognac to deglaze the pan, scraping up any delicious browned bits from the bottom. Cook until most of the alcohol has evaporated, leaving behind a lovely aroma.
5. Finish the Sauce: Now, add your prepared broth mixture to the pan. Let it simmer and reduce slightly for about 3 minutes until it starts to thicken. Stir in the heavy cream and continue to cook for another 2 to 3 minutes until the sauce is beautifully rich and thickened.
6. Combine & Garnish: Return the rested steaks and any accumulated juices back into the pan with the luscious sauce. Spoon the sauce generously over the steaks, then sprinkle with fresh chopped chives, green onion, or parsley for a vibrant finish. Serve immediately and enjoy your gourmet creation!