Step 1: Lighting
Natural lighting is key if you can make it happen. If you are shooting during the day, be sure to get a seat by the window to enhance the shot with natural light. Shooting by natural light also allows the photographer to play with shadows.
If you are dining at night, you will need to create your own light source. Whether using my iPhone or Canon rebel XS camera, I always light my image with an external light. For an external light, I usually just use an iPhone flashlight.
Expert tip: Never take a photo with the flash, as it distorts the color of the image.
[Photos via @onemoredish]