Goya is the Japanese word for that kind of bitter melon, so she's basically trying to trip him up into saying "Goya".
Kancolle 2-koma Theatre, Part 5How did you know that?What's this in English?Go-ya ✕ 10Idea: Yuuji
Artist KoujiGoya GoyaAdmiral, let's have a quiz!! Say Goya ten times.Goya Goya Goya Goya Goya Goya Goya Goya.