This stuffed flank steak with prosciutto and mushrooms is a delicious and impressive dish that is perfect for a special occasion or a fancy dinner. The flank steak is butterflied and filled with a savory mixture of prosciutto, mushrooms, and herbs. It is then rolled up and roasted to perfection, resulting in a tender and flavorful steak. Serve it sliced with a side of roasted vegetables or mashed potatoes for a complete meal.