The first one at the entrance of Dengganba Vegetable Market, the most authentic and delicious. Although it is not a roast duck restaurant, this is the conclusion I came to after eating in many places. This is the most like Beijing roast duck I have ever eaten. You can ask him to give you an extra bag of dough - it is more delicious! It's probably about twenty or thirty half duck, and he will give you a good slice of it.