Taiwanese castella; Taiwanese sponge cake
A light, fluffy sponge cake originally derived from Portuguese castella, popular in Taiwan and often sold as a street food or souvenir.
Taiwanese castella is fluffy and mildly sweet.
I bought Taiwanese castella as a souvenir.
From 台湾 (Taiwan) + カステラ (castella, from Portuguese pão de Castela). The cake is a Taiwanese variation of the original Portuguese-inspired sponge cake.