The base of Jaffa Cakes is an Italian sponge cake named after what city?
Jaffa Cakes:  The most common form of Jaffa Cakes are circular, 2+1/8 in in diameter and have three layers: a Genoise sponge base, a layer of orange flavoured jam and a coating of chocolate. Genoise: A genoise ( , , , or ; ] ; "Genoese cake" or "Genovese cake"; rarely spelled "génoise" in English) is an Italian sponge cake named after the city of Genoa and associated with Italian and French cuisine.
Genoa