I remember seeing a few years ago now, a photographic trick of the trade also employed by film/TV photographers, when shooting food for adverts. There's a liquid which is poured over the prepared food which really brings out the colour of the food making it look so much more appetising for the photograph/commercial. To all intense and purposes it makes the food inedible I think but is perfect for the task of making it look good for the picture/commercial. Maybe it's veg oil ? Does anyone here know exactly what it is that they pour over the food ?