Final answer:
The tradition Pepe is referring to is eating 12 grapes on December 31st to symbolize good luck for the upcoming year.
Step-by-step explanation:
The tradition or custom that Pepe is referring to is eating 12 grapes on December 31st. In some Spanish-speaking countries, including Mexico, it is a common tradition to eat 12 grapes at the stroke of midnight to symbolize good luck for the upcoming year. Each grape represents a month of the year, and people make a wish for each grape they eat.
Learn more about Spanish traditions