It’s eggnog season. The boozy beverage dates back to medieval England but remains a holiday hit

SAN FRANCISCO — At Scoma’s Restaurant in San Francisco, this holiday season ‘s batch of eggnog began 11 months ago. “It’s a wonderful, specialty drink,” Kenny said of Scoma’s recipe, which has been honed in recent years to take advantage of the boozy beverage’ s aging process. “A drink that you would sort of associate with grandma and grandpa on the holidays has become like a cult favorite here,” Gordon Drysdale, Scoma’s culinary director, said earlier this month. “I like to say it’s a little Christmas magic,” said Jamie Gourges, marketing manager for the open-air bar in the city’s iconic French Quarter. “I live a block away so I’m here every day but I’m happier during Christmas.” Even for tourists who came for the bar’s signature “purple drank” daiquiri, the holiday beverage beckons.