For fried liver: Tianxingju is the source of fried liver, and it is an old brand with super flavor. It was once rated as a famous snack in China. There are Fish Mouth Shop and Jade Dragonfly Bridge Shop (Tiantan East Road); Yao Ji fried liver is a rising star, but the pavement is large and expensive.

For roast duck, the old brands are Cheap Square and Quanjude. The former is braised roast duck, characterized by fragrance, while the latter is hung roast duck, characterized by crispy skin. Dadong Roast Duck is a state-owned "Beijing Roast Duck Restaurant" originally aggregated by private owners, which belongs to comprehensive flavor.

As for tripe, it's basically the same. The key difference lies in the taste of the seasoning.

If you don't care about money, go to a five-star restaurant and order these specialties. These restaurants know the characteristics of the dishes better than anyone else, the only drawback is that they are expensive.