The Blue Onion pattern, despite its name, is not of Chinese origin nor does it depict onions. It is a classic German porcelain design that originated in the mid-18th century at the Meissen manufactory. 

The pattern features stylized floral motifs, often including peonies and asters, arranged in a way that was misinterpreted by early observers as onions, hence the enduring name. Fish-shaped dishes and molds have a long history in European ceramics, often used for serving fish courses or as decorative items. The combination of the Blue Onion pattern with a fish form is a distinctive decorative choice, likely produced by various manufacturers attempting to replicate the success of Meissen's iconic design. These pieces were popular for their aesthetic appeal and functional use in dining settings.