“Every Jewish family produces a unique version of the Passover seder—the big ritual meal of traditional foods, served after and amid liturgy, storytelling, and song. We’re all surprised at each other’s customs: ‘You eat lamb? You don’t sing ‘Chad Gad Ya’? And yet, virtually every seder does share a few common elements. Matzoh crumbs all over the floor. Wine stains on the tablecloth. A seder plate containing the traditional symbols of the holiday: a roasted shank bone and hardboiled egg, recalling the days of the Temple sacrifices; horseradish and salt water for the bitterness of oppression; parsley for spring; haroset, a mixture of wine, nuts, and fruit symbolizing mortar and the heavy labor performed by the Israelite slaves…”