the most basic meaning of roasting is roasting.

if you translate this sentence directly, it means that there is nothing better than duck in Beijing, especially roast duck!

To make it clearer, I'll quote you a special information about Beijing Roast Duck:

As an ancient saying goes, "Duck is the most delicious food in the capital, and roasted duck is the best". Among the tens of thousands of dishes in China, Peking Duck is well known to both China and foreigners. Roast duck technology has a long history in China. As early as the Southern and Northern Dynasties (42-589), there was a record of "roasted duck" in the Record of Food Treasures. Historically, Beijing roast duck has been divided into stewing roast duck and hanging roast duck in the production method. Stewed roast duck was founded in the 14th year of Yongle in Ming Dynasty (AD 1416) and has a history of nearly 6 years. The hanging roast duck evolved from the improvement of the cooking technology of braised roast duck after hundreds of years. The preparation methods and taste characteristics of braised roast duck and hanging roast duck are different. So there are two schools in the history of roast duck. Lu Guangzhao, a contemporary celebrity, once wrote a celebrity motto of "Stewed roast duck is different from hanging roast duck" in a cheap square, which deeply hides the characteristics of crispy skin, tender meat, crisp fragrance and fat but not greasy in the food culture.

I hope I can give you some idea.