Which Spanish New Year's Eve tradition involves eating one grape with each of the 12 clock chimes?

Spain’s New Year’s Eve tradition of eating one grape with each of the 12 clock chimes is called the twelve grapes.

People try to eat a grape at each midnight chime, with the 12 grapes symbolizing the 12 months of the coming year. Completing the sequence is popularly associated with good luck and prosperity. The custom is particularly linked with the chimes broadcast from Madrid’s Puerta del Sol.

The tradition is often connected with a surplus grape harvest in the early twentieth century, although accounts of its exact origin vary. Modern celebrations may use prepared tins of peeled or seedless grapes because the chimes arrive quickly. The 12 preliminary quarter-chimes heard before the main sequence are not counted as grapes; the eating begins with the first of the 12 midnight strokes.