Later, some friends in the food industry suggested that he first freeze the bananas to – 10 ° C, and the next day lower the temperature to – 20 ° C. He experimented for years before finding the secret, which is that the temperature can ’ t be lowered too quickly, or the bananas will oxidize and turn black. That wouldn ’ t be good for sales.
後來食品業朋友建議他，可以先把香蕉放進零下 10 度的冷凍庫冷凍，第二天再降到零下 20 度，實驗了好多年他才找到訣竅，也就是溫度不能一下子過冷，否則香蕉會氧化變黑，賣相就不佳。