What is the Spanish New Year's Eve tradition of eating one grape at each of the 12 midnight chimes called?

The Spanish tradition of eating one grape at each of the 12 midnight chimes is called Las doce uvas de la suerte.

The phrase means “the twelve grapes of luck.” Participants try to eat one grape with each stroke of the clock at midnight on December 31. Successfully completing the sequence is traditionally believed to bring good fortune for the twelve months of the coming year.

The custom is strongly associated with the clock at Madrid's Puerta del Sol, whose chimes are broadcast nationwide. Families and friends often prepare twelve grapes in advance because the interval between chimes is short.

The exact origin is debated. A popular account links the custom to a surplus grape harvest around the beginning of the twentieth century, while evidence also points to an earlier upper-class practice of eating grapes with champagne. Whatever its precise beginning, the ritual is now a defining Spanish New Year's tradition.