At Burger King restaurants, frozen hamburger patties are placed on a conveyer belt and emerge from a broiler ninety seconds later fully cooked. The ovens at Pizza Hut and at Domino's also use conveyer belts to ensure standardized cooking times. The ovens at McDonald's look like commercial laundry presses, with big steel hoods that swing down and grill hamburgers on both sides at once. The burgers, chicken, french fries, and buns are all frozen when they arrive at a McDonald's.