Castella
In its own language: カステラ
Sweet, moist Japanese sponge cake with roots in Portuguese baking
Castella is a light, moist sponge cake popular in Japan, especially in Nagasaki. Brought by Portuguese traders in the 16th century, it is now a traditional Japanese confection made with flour, eggs, sugar, and mizuame syrup. Castella is often enjoyed as a sweet treat and comes in rectangular loaves, sometimes with coarse sugar on the bottom.
- Brought to Japan by Portuguese traders in the 16th century
- Nagasaki is famous for its Castella specialty
- Mizuame syrup makes the cake extra moist
- Baby castella is a popular festival snack
- Taiwanese castella is softer and custard-like
What is Castella?
Castella is a rectangular sponge cake with a golden-brown top and a light, moist crumb. Its main ingredients are flour, eggs, sugar, and mizuame, a sweet syrup that gives the cake its signature moistness. Sometimes coarse sugar, called zarame, is sprinkled on the bottom for a crunchy texture. The cake is usually sold in long boxes and sliced before serving. The taste is sweet and delicate, with a soft, springy bite.
Where does Castella come from?
Castella was introduced to Japan by Portuguese traders in the 16th century, during a period when Nagasaki was the only port open to foreign trade. The original cake, called 'Bolo de Castela' or 'cake from Castile,' was adapted over time to suit Japanese tastes, including the addition of mizuame syrup. Although it began as a foreign import, Castella became a specialty of Nagasaki and is now considered a traditional Japanese sweet, or wagashi.
How is Castella made?
To make Castella, eggs and sugar are beaten together until very light, then flour is folded in. Mizuame syrup is added to increase moisture. The batter is poured into square or rectangular molds, sometimes with zarame sugar sprinkled on the bottom. The cake is baked until golden, then cooled and cut into slices. It is typically sold in long loaves, about 27 centimeters in length.
How and when is Castella eaten?
Castella is enjoyed as a snack or with tea, often served in thin slices. It is a common treat at festivals and can be found in sweet shops, especially in Nagasaki. Baby castella, a bite-sized version, is popular at festival stalls. The cake is sometimes given as a gift or served to guests. Its soft texture and mild sweetness make it suitable for all ages.
Kinds of Castella
Modern Castella comes in many flavors, such as green tea, brown sugar, chocolate, and honey. In Taiwan, a local version is more soufflé-like and may have a custard center, with a pillow shape being a specialty in Tamsui. Siberia is a variation where Castella is filled with sweet bean jelly. Castella batter is also used for dorayaki pancakes, which are filled with sweet adzuki bean paste.
What Castella means
Castella is a symbol of Nagasaki and a well-loved Japanese sweet. It appears in literature and anime, reflecting its place in daily life and memory. Long-established bakeries in Nagasaki are famous for their Castella, and the cake is often associated with festivals and special occasions. Its presence in popular culture and continued adaptation show its lasting appeal.
Questions people ask about Castella
What is Castella made of?
Castella is made from flour, eggs, sugar, and mizuame syrup. Sometimes coarse sugar, called zarame, is added to the bottom for texture.
Where does Castella come from?
Castella was introduced to Japan by Portuguese traders in the 16th century and became a specialty of Nagasaki.
How is Castella different from other sponge cakes?
Castella uses mizuame syrup for extra moisture and sometimes has coarse sugar on the bottom. It is usually baked in rectangular molds and sliced for serving.
Are there different flavors of Castella?
Yes, Castella is made in flavors like green tea, brown sugar, chocolate, and honey. There are also regional versions, such as Taiwanese castella, which is softer and more custard-like.
When is Castella usually eaten?
Castella is enjoyed as a snack or with tea and is often found at festivals or given as a gift.
Good reading and sources
The facts on this page come from the Wikipedia article "Castella", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Thali rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and it is not dietary or allergy advice: recipes differ from cook to cook. If something is wrong, tell us. Last refreshed 2026-10-03.
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