The proper way to eat Beijing roast duck is to dip duck slices in sweet noodle sauce with shredded onion and roll them in lotus leaf cake. It tastes slightly sweet, but it has no taste if it is pure meat. If it is skinned, it will taste like duck oil, and if it is eaten with a white mouth, it will be a little greasy. Because I am from Beijing, I generally don't go to Quanjude Cheap Shop to eat roast duck. First, it is expensive, and second, it is not so delicious. I will take a duck rack home and sometimes eat it with a white mouth.
Speaking of your topic, if you haven't eaten it, I really recommend trying it, but you don't have to go to those famous restaurants, such as Quanjude, Cheap Square and Dadong. Many restaurants in Beijing have roast duck. If you eat it, I suggest going to lunch. At that time, it is usually freshly roasted, and it is likely to be left over at noon at night.