Why is it called a ginger jar? - Questions & Answers | 1stDibs
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Why is it called a ginger jar?

With a similar shape to the baluster jar, Chinese porcelain ginger jars have a rounded form, with broad shoulders tapering to the base and a narrowed neck topped by a domed lid. The unusual name comes from the export market, wherein salt and spices such as ground ginger travelled West in lidded storage vessels.

Answer provided by Pagoda Red