A casserole don't know if you've heard of it. In Shaoxing is very famous, because I also like to eat casserole, so with the chef inside the good deal after learning a bit of technology. Soup raw materials are mainly copper bone (pig's hind leg bone) and chicken frame with some spices, spices (cumin, star anise, grass nuts, Sannai, white kou, cinnamon, cloves, incense,) and so on. It's boiled, very fragrant and fresh. Then on the homemade oil, the chef refused to say but still gave me know, is the chicken oil and duck oil simmering, specific simmering method is not very understand.