hamantasch

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A triangular pastry with a filling such as preserves or poppy seeds.

Wiktionary

1. n. A traditional Ashkenazi three-cornered cookie eaten during the Jewish holiday of Purim. The filling may be made from variously from poppy seeds, prunes, nuts, dates, apricots, fruit preserves, chocolate, caramel, or cheese.