Bonjour Helena, That's a very interesting question indeed! Let's point out first that we're talking about the relative pronouns here, which are used to introduce a new information in a sentence (as opposed to question words like "what?"). Once you know this, the separation is quite simple: "qui/que" can mean "who/which/that ..." whereas "ce qui/ce que" mean "what ...".
I hope that's helpful!
Bonjour Ron !
In the case you pointed out, I agree that if what was found fascinating was only the bananas, you could use que, as follows :
Bonne journée !
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