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|Place of origin||Portugal|
|Main ingredients||Flour, sugar, eggs, mizuame|
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.
There are similar types of sponge cakes named after the same fashion, in French: Pain d'Espagne, in Italian: Pan di Spagna, in Portuguese: Pão de Espanha, in Romanian: Pandișpan, in Bulgarian: пандишпан, in Greek: Παντεσπάνι, in Turkish: Pandispanya. (Castile was a former kingdom of Spain, comprising its north-central provinces, thus Pain d'Espagne and other variants are quasi-synonymous to "bread from Castile"). A similar cake, called taisan, is a traditional dessert in Pampanga province in the Philippines.
In the 16th century, the Portuguese reached Japan and soon started trade and missionary work. Nagasaki was then the only Japanese port open for foreign commerce. The Portuguese introduced many then-unusual things, such as guns, tobacco, and pumpkins. The cake could be stored for a long period of time, and so was useful for the sailors who were out on the sea for months. In the Edo period, in part due to the cost of sugar, castella was an expensive dessert to make despite the ingredients sold by the Portuguese. When the Emperor of Japan's envoy was invited, the Tokugawa shogunate presented the Castella. Over the years, the taste changed to suit Japanese palates.
There are now many varieties made with ingredients such as powdered green tea, brown sugar, and honey. They may be molded in various shapes; a popular Japanese festival food is baby castella, a bite-sized version.
Castella were first introduced to Taiwan during the age of Taiwan under Japanese rule. In 1968, Ye Yongqing, the owner of a Japanese bakery in Taipei named Nanbanto, partnered with the Japanese company Nagasaki Honpu to establish a castella business. Another company Hometown of One, established in 1975, adapted the recipe to better suit Taiwanese tastes, creating varieties that incorporated Taiwanese Longan honey and Japanese cheese. With these changes and with heavy promotion, castella quickly became a favourite amongst the Taiwanese people.
The most popular variety of castella in Taiwan is Honey Castella. Honey is not a necessary ingredient in the original Japanese recipe, and honey castella are therefore uncommon in Japan. However, in Taiwan, customers prefer this modified version of castella, which has a strong scent of thick honey.
Another Taiwanese variety, rock-baked castella is a double-baked cake in a circular shape, with a honey castella base and a cheese-based topping. They are usually more expensive than honey castella.
- Bunmeidou History of Castella  Archived June 22, 2008, at the Wayback Machine
- "The old-timey treat that's back in style thanks to Hayao Miyazaki". RocketNews24. 2013-09-08. Retrieved 2017-01-08.
- Official site of Nanbanto. 2018.
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