I shot a food party tonight, for a glossy magazine. This included, of course, some food shots.
My setup was simple:
One 430EX flash in an umbrella above the food, and one 430EX direct flash with grid side/behind the food.
The camera: a Canon 1Ds MkIII with a 100mm f/2.8 EF Macro lens, with a 580EX flash fitted to drive the other two flashes. I set the camera to manual, f/8 at 1/125th second, 200 ISO, and used wireless E-TTL to drive the external flashes.
The shots: like this one of an Alu Gobi dish (it was freshly cooked Indian food):
See the steam?
And the food? Delicious.