"Can you eat the food you photograph?" or "what are all the tricks to make the food look so good?" are the two questions I am most often asked about as a food photographer. Surprise registers when I say pretty much the only thing used is a little olive oil .
The only time I can remember a trick is when we put raw new potatoes in a salad, as with cooked potatoes the skins slide off . I would say lighting, fresh ingredients and props are the keys to a strong food photograph however some food photographers try other approaches - check this video out