I SPENT much of the last several years working on a new Haggadah — the guidebook for the prayers, rituals and songs of the Seder — and am often asked why I would want to take time away from my own writing to invest myself in such a project.

All my life, my parents have hosted the Seder on the first night of Passover. As our family expanded, and as our definition of family expanded, we moved the ritual dinner from our dining room to our more spacious, mildewed basement. One table became many table-like surfaces pushed awkwardly together. I always knew Passover was approaching when my father would ask me to take the net off the ping-pong table. All were covered in once matching, stained tablecloths.