Observed on June 8 in the USA and Canada, this food holiday celebrates doughnuts with a jelly filling. Much like the Polish Pączki, German Berliner, or the Sufganiyah in Israel, the recipe for a deep-fried piece of dough or batter filled with jelly was first documented in a 1532 German cookbook called. Kuchenmeisterei, which translates to “Mastery of the Kitchen.”