Castella (カステラ, kasutera) is a kind of wagashi (a Japanese traditional confectionery) originally developed in Japan based on the "Nanban confectionery" (confectionery imported from abroad to Japan during the Azuchi–Momoyama period). Now a specialty of Nagasaki, the cake was brought to Japan by Portuguese merchants in the 16th century. The name is derived from Portuguese Pão de Castela, meaning "bread from Castile". Castella cake is usually sold in long boxes, with the cake inside being approximately 27 cm long. It is somewhat similar to Madeira cake, also associated with Portugal, but its closest relative is pão-de-ló, also a Portuguese cake.
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