In oral speech or writing, it is grammatically correct to say "let's eat some brain"? Could you please give me some example of a more correct form of this kind of expression? 

Edit

Thank you for your answers. Anyway, I apologize for being mysterious about the context of my question. 
My friends and I have a web radio show; this week we are going to talk about zombies and the title of the episode is "Let's eat some brain!", so I was wondering if a native english speaker would approve this sentence.