I'm not much into food. I'm kinda the "I eat because I have to." My disclaimer is that I'm not an expert but here are a few interesting stories that might be relevant to this story. I come from a place where there is a huge influence of the Japanese and grew up in folklores punctuated with Japanese stories. I got to know a tad more, when one of my school-friend took a keen interest in digging up British and Japanese…
In Ireland, I'm used to the idea that Indian restaurants are run by Pakistani men, and Chinese restaurants are run by Malaysian women.
So they can possibly be "Malaysian women" and also ethnic Chinese.