These small triangular pastries hold a sweet filling, either of honey-poppy seed, prune or apricot. They're one of the traditional sweets of Purim, a festive Jewish holiday. Also called Haman's hats after Haman, the wicked prime minister of Persia who plotted the extermination of Persian Jews. Haman's plot was foiled at the last minute and the joyous festival of Purim was proclaimed in celebration.