The fifteenth Day of the eighth Moon, is ſolemniz'd by the Chineſes with great feaſting and rejoycing. […] To this purpoſe, the preceding Days they ſend to one another Preſents of little Loaves and Sugar-Cakes, which they call Yue Pim, or Moon-Cakes. They are round, but the biggeſt, which are about two hands breadth in diameter, and repreſent the Full Moon, have every one a Hare in the middle made of a Paſt of Walnuts, Almonds, Pine-Apple-Kernels and other Indgredients. Theſe they eat by the Light of the moon; the Richer ſort having their Muſick alſo playing about 'em, which is very good.
Source: wiktionary