Castella: a moist sponge cake made from eggs, flour, and sugar; often associated with Nagasaki as a specialty.
長崎名物のカステラをお土産に買ってきた。
I bought Nagasaki's famous castella as a souvenir.
あの店のカステラはしっとりしていて紅茶に合う。
That shop's castella is moist and goes well with tea.
母は休日に自家製のカステラを焼くのが好きだ。
My mother likes to bake homemade castella on her days off.