Take the steaks out of the refrigerator 30 minutes before they need to be cooked. Lightly sprinkle them with salt and pepper and let them rest at room temperature. Turn on the oven to 120-135 degrees Celsius (248-275 degrees Fahrenheit) (depending on how strongly your oven heats). Place the steaks in an ovenproof dish. Place the dish in the oven until the core temperature of the meat is 48 degrees Celsius (118 degrees Fahrenheit). Take the meat out of the oven. Heat a frying pan with oil - it should be very hot. Add a knob of butter to the pan and fry the meat over high heat for 45 seconds on each side. Cook the meat until it has formed a good crust and the temperature is 55 degrees Celsius (131 degrees Fahrenheit) (medium rare). Remove the meat from the pan. Serve immediately!