Castella (kasutera) is Nagasaki’s most famous sweet, a moist, fine-grained sponge cake with a springy texture and a rich, honeyed sweetness, baked in a distinctive tall loaf with a brown top and bottom crust and a sticky layer of sugar crystals at the base. It was introduced to Nagasaki by Portuguese merchants in the sixteenth century — its name comes from ‘bread of Castile’ — and over 400 years Japanese bakers refined the simple recipe of eggs, flour, sugar and starch syrup into the beloved cake it is today. Nagasaki’s long-established castella houses, some centuries old, are the best place to buy it, offering samples, tea-and-cake sets, and beautifully boxed loaves that make Nagasaki’s classic souvenir. Simple, comforting and delicious, a slice of freshly made castella with green tea or coffee is a quintessential Nagasaki treat.
🗓️ At a Glance
| Location | Central Nagasaki |
| Hours | Shop hours (daytime) |
| Admission | Free to browse; buy per box |
| Time needed | 30–45 minutes |
| Best time | Year-round |
What to Try
- Moist, honey-sweet castella sponge cake.
- The sticky sugar-crystal layer at the base (zarame).
- Tea-and-cake sets at historic castella houses.
- Beautifully boxed loaves as Nagasaki’s classic souvenir.
Combine Your Visit
- Combine with Dejima , the Portuguese-Dutch legacy.
- Pair with the Dutch Slope historic street .
- Read our Nagasaki overview .
Getting There
- On foot: castella houses across central Nagasaki.
- By tram: central stops near the main shops.
Tips
Buy castella from one of Nagasaki’s long-established specialist houses for the best quality, and try a tea-and-cake set to taste it fresh before choosing a boxed loaf to take home. Look for the sticky zarame sugar crystals at the base as a sign of quality, note there are now flavoured varieties (matcha, chocolate) too, and it keeps well as a souvenir.
