A little background on the doughnut that became the token Chanukah sufganiya:
Jelly doughnuts, known as Sufganiyah (סופגניה, pl. Sufganyot סופגניות) in Israel have become a traditional Hanukkah food in the recent era, as they are cooked in oil, associated with the holiday account of the miracle of the oil.
Origin: In Germany, the doughnut equivalents are called Berliners, except in the city of Berlin, where they are called Pfannkuchen. In southern Germany they are also called Krapfen and are especially popular during Carneval season (Karneval/Fasching) in Southern and Middle Germany and on New Year’s Eve in Northern Germany. These do not have the typical ring shape but instead are solid and usually filled with jam. Bismarcks and Berlin doughnuts are also found in the U.S. Doughnuts similar to these are also prepared in the Northern Balkans, particualrly in Croatia and Serbia’s Vojvodina province. They are called krofna, a name derived from a German word for this pastry. This type of doughnut is popular in Chile because of the large German community there and is called a Berlin (plural Berlines). It may be filled with jam or with manjar, the Chilean version of dulce de leche.