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Preheat the oven to 340°F/170°C.
Castella cake is a popular Japanese honey sponge cake. It’s super soft, jiggly to the touch, and mildly sweet. It melts in your mouth as you eat it. It was brought to Japan by Portuguese merchants in the 16th century, and developed into this delicate, honey-flavored sponge cake of today. The name is derived from Portuguese Pão de Castela, meaning “bread from Castile”.