These pictures were taken for a Japanese restaurant's menu illustration (not to really show the food, but will be used more like a watermark) near my house. I frequent this place so often with my camera, about a week ago they asked me whether I'm a photographer. LOL. The Japanese restaurant strangely called "Japanese Restaurant"; yes, very creative indeed.
The first picture is not actually a Japanese food but (supposedly) Vietnamese. Knowing I'll be there, the cook from their friend's restaurant came in to prepare that dish to be photographed (and several other Vietnamese staples too).
As far as WB goes, if it's not mixed lighting like the situation above, I just use the preset WB and that's it. If it's mixed lighting, I use AWB, if it's crazy mixed lighting, I got no choice but to use my Expodisc. However, for food it makes the picture too cold, so I'll have to apply 85B emulation filter using Photoshop at 25% intensity.