In China, noodles are not just another pantry staple. They can carry wishes for longevity, prosperity and good fortune, which is why something as ordinary as snapping them in half before cooking can be viewed as an unfortunate gesture. The belief is particularly associated with long-life noodles, or changshou mian, traditionally eaten on birthdays and other important occasions. Their length is the point. The noodle is meant to remain long, symbo…