To achieve the perfect doneness for Tagliata di Manzo, aim for an internal temperature of 140°F (60°C) for medium-rare steak. Use a meat thermometer to check the internal temperature. Grill the steaks for 3-4 minutes on the first side and another 3-4 minutes on the second side. After grilling, let the steak rest under aluminum foil for 5-10 minutes before slicing. This rest period helps the juices redistribute for a tender, flavorful steak.