Catherine Zeta-JonesCatherine Zeta-JonesCatherine Zeta-Jones has revealed a culinary secret.

But, is there something fishy on the go?

Yes, if you're referring to the ingredients Cath's been nattering about.

And it does sound rather droolicious.

According to the Daily Mirror, Cath has revealed that the ingredients of her perfect sandwich have helped her stay slim.

So, just what keeps Cath's bread buttered on both sides?

The paper says Cath's treat is smoked salmon sandwiches, on brown bread, with crushed potato chips in the middle, drizzled with some lemon juice, salt and pepper.

Tasty.

Talking about her sarnies, IMDB.com quotes Cath as saying: "I had them during each of my pregnancies and I actually had it two nights ago for dinner as well."

And what's hubby Michael Douglas' take on all this?

Cath reportedly said: "It's one of those comfort foods I really love. Michael hates it. He thinks it's gross.

"There's plenty of things I like to eat that make him really wants to throw up - like Marmite."

A little TMMI - Too Much Marmite Info - for us, but the rest sounds delish.