The megillah for Plum-Jam Purim or Powidlpurim, a family Purim celebrated by the Brandeis family of Bumsla, Bohemia (Czech: Mladá Boleslav; German: Jungbunzlau) on 10 Adar to commemorate David Brandeis’ liberation from prison on trumped-up charges of poisoning. First published along with a German translation and some genealogical notes in Magazin für die Wissenschaft des Judenthums, vol. 15, 1888. According to Chef/Rabbi Gil Marks z”l, the celebration of Plum-Jam Purim was the origin of prune hamantaschen as a concept — prior to 1731 all hamantaschen had a poppy seed filling!