Well, considering the kind of person he is, I kind of imagine he would be.
(In Shetland, Douglas Henshall plays a detective who can't cook; just thought I'd mention that here.)
To be honest, I read your message a few days ago and went away and thought about it and now I kinda have an idea for a fic where Nick can cook, really well. And kinda woos/impresses Stephen with his cooking.
So now I'm writing it and I'll drop you a link for it when it'd done, if you want to read it. XD