Not quite sure if this what you were thinking of for the children's Christmas stocking.
The official website www.panjiayuan.com (in English also) describes it as an important sight for any tourist in Beijing, along with climbing the Great Wall, touring the Forbidden City and eating Beijing duck. Here you can mix with people of different colours, languages, religions and social status. Even royalty and presidents have visited, so you don't have to feel embarrassed to be seen here. In case you do there is now even an online purchasing option on the Panjiayuan website.