The Fancy Food Show returned to Moscone Center last week, and as usual the task of shuffling from one free sample to another was more challenging than might be expected. The Center, as you probably know, covers several acres of sprawling subterranean SOMA real estate, and last Sunday, Monday and Tuesday a hefty percentage of its floorspace was carpeted with 1,250 booths offering nibbles from here, there and around the globe. As a professional food writer with an obsessive-compulsive streak, I re