The shape with bulges is made by rolling coarse sugar and showering granulated sugar water in a large spinning tub for several days, but considerable skills are needed to correctly adjust the speed of the rolling, otherwise the shape would become round.
ザラメに溶いたグラニュー糖をかけつつ数日大釜で転がすだけであの形になるが、その回転の加減でまん丸になってしまうため熟練の大技がなす形状）