Food can be an incredibly polarizing subject, especially when you get into regional delicacies. I've recoiled at the thought of eating Australia's Vegemite, and the pungent, gooey mess of natto - a fermented soybean dish from Japan. But neither bothers me as much as the questionable-looking chop suey sandwiches of New England. Before this weekend, I lived a pretty innocent existence where food is concerned. My biggest food complaint has been with deep dish pizza, which is actually a tomato soup…