Food. Everyone loves it. Photographing food in restaurants is not all that difficult, but you have to be quick. Find a table near a window, backlight your food and bounce a little light back into it with a collapsable reflector, or even a menu, and expose for the near side. That's it. If it's ice cream, however, be ready to shoot fast. Within a couple minutes your dessert will look like Frosty the Snow Man in June. Just a big colorful puddle. Make sure you let the restaurant know what you are doing and don't take too long. The meal is, after all, more important than the photos.