We will return to you

Tomorrow morning, God willing, for the thirty-something consecutive year (I'd rather not say precisely how many), I am making a celebration for completing a tractate of Talmud on the eve of Pesach. I am a firstborn son, and on the eve of Passover, all firstborn sons must fast unless they participate in a seduath mitzva (a meal that is itself a mitzva). Traditionally, this is accomplished by