Phil @ MAKE posted this recipe for how to make hamentashen Purim cookies. From the site:

Hamentaschen, or Hamen’s hats, are triangular cookies to celebrate Hamen’s defeat at Purim (see the Book of Esther). In Hebrew, they are called Oznei Haman – Hamen’s ears. They are eaten at Purim and included in mishloach manot, the Purim mitzvah of giving food to the poor and friends. Traditionally, Ashkenazi hamentashen are triangular (hat shaped) butter cookies stuffed with prune, apricot or poppy fillings, although variants are widespread. In Sephardi traditions, they are sometimes fried circles (ear shaped). Our recipe is a dairy Ashkenazi version; we’ve also included links to alternatives.