In many countries, Christmas is considered a propitious time for fortune-telling.  In Switzerland, an onion and salt are traditionally used to predict:

On Christmas Eve, the grandmother of the house cuts an onion in two and peels off twelve layers.  Each layer represents one month in the coming year.  Each is filled with salt.  If the salt is dry on Christmas morning, the corresponding month will have fair weather; if damp, there will be rain.