Check out the video above to see how to cook the perfect steak using Weber’s smart gas grill, and then scroll down for step-by-step instructions on how to bring your grilling game to the next level. PREP THE GRILLNext, turn your attention to the grill, which needs to preheat to the proper temperature in order to give your steak a good sear. (Meat also sticks more readily to a cool grill, making cleanup a nightmare and wrecking any chance of perfect grill marks.) For flank steak, preheat the grill to 450 to 550 degrees Fahrenheit and set an internal temperature alert for 125 degrees Fahrenheit for medium-rare. Place the steak on the hot grill and select “Start Monitoring” on the Weber Connect app.