If the Brits have their chip butty, Japan has its yakisoba pan. Perhaps the country's most famous carb-on-carb creation, 焼きそばパン yakisobapan is just what you imagine it is: a yakisoba noodle sandwich. It's a hefty serving of stir-fired yakisoba noodles, with their characteristic savory, tangy sauce, and sometimes extras like beef, cabbage,…