What does "what" refer to here?
Native speaker’s answer
Rebecca
"What" in this sentence means "the thing that..." It is being used as a pronoun in this sentence and refers to the concept of what Ross thinks is unagi. Here are example sentences of "what" being used as "the thing that." Ex: I don't know what I have in that box. Ex: It's what I like to call fun. Ex: I will tell you what I want to do tonight, I want to sing karaoke!