Beijing roast duck is troublesome to make, and the authentic taste is rare, just those in Beijing, and the price is very high. Crispy roast duck belongs to popular consumption, but it must have its own taste, otherwise it will not be easy to open the market. At present, the most popular dish in the market is hand-torn duck roasted in gas rotary oven. As long as the taste is grasped, the profit is still very good.