The amazing chickpea becomes falafel with the help of herbs and seasonings, and then it becomes a sandwich, with the standard garnishes except for one important addition, thanks to Ann, who wouldn’t stop talking about the roasted eggplant at L’As du Fallafel, a kosher sandwich shop in Paris that serves what some call the best falafel anywhere. It makes wonderful sense to add eggplant to this sandwich. It adds a depth of flavor that none of the other ingredients can provide,