Kasutera, also known as Castella, is a moist and springy Japanese sponge cake made with just eggs, sugar, flour, and starch syrup, traditionally baked in long rectangular molds. It has a golden-brown top, a fine, honey-sweetened crumb, and a signature slightly chewy bottom crust. Originally brought to Japan by Portuguese missionaries in the 16th century, Kasutera has become a beloved wagashi (Japanese-style Western sweet), especially in Nagasaki, where it is often sold as a gift or souvenir.

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