This recipe for flank steak with mushroom sauce is a hearty and flavorful way to enjoy a steak dinner at home. The steak is pan-seared to create a crispy crust, then finished in the oven to ensure it is cooked to perfection. The mushroom sauce is made with a mixture of mushrooms, shallots, garlic, and beef broth, then simmered until it is thick and flavorful. The result is a tender and juicy steak with a savory and earthy sauce that is perfect for a cozy night in.