Castella is a popular Japanese sponge cake type wagashi made of sugar, flour, eggs, & starch syrup. Now a specialty of Nagasaki, the cake was brought by way of Portuguese merchants in the 16th century. The name is derived from Portuguese Pao de Castela, meaning "bread from Castile". Castella cake is usually sold in long boxes. This castella is from the famous sweets shop Ginza Bunmeido located in Ginza, Tokyo.