This month, Gastro Obscura is sharing the recipes and stories behind amazing holiday dishes and drinks from around the world in the ongoing series “Home-Cooked Holidays.” In Mexico, ponche Navideño—or Christmas punch—is a holiday classic, served up at parties and posadas, neighborhood-wide re-enactments of Mary and Joseph seeking shelter for the birth of Jesus. “Christmas in particular has so many foods and rituals attached to it. So you would have your ponche and your tamales,” says Lesley Téllez, a food writer and the author of the cookbook Eat Mexico. But…