Honestly, taking a good enough picture of food is pretty easy, except when you want to be misleading.
Tricks like knowing exactly what you are allowed and not allowed to substitute for 'better looking'. For example knowing you can substitute something for milk when taking picture of cereal, because something with glue 'looks nicer'. Or carefully arranging the ingredients so that while the burger is technically using the same ingredients as what you get, the ingredients are all to one side so it looks like more from the angle of the camera.
For casually accurate pictures of a small restaurant menu, just take pictures in average lighting and it will be fine.