At Passover seders, Persian Jews break out the scallions

As Jews around the world prepare for feasts known as seders commemorating the biblical exodus from slavery, there's a whole list of provisions people are busy gathering to bring the traditions to life. For Persian Jews, green onions - and lots of them - top the list. The ropelike spring greens come out during a particular song, and they're not used for cooking, but for mayhem. The World's Sarah Birnbaum explains.