Jam doughnut

A jelly doughnut, or jam donut, is a doughnut with a fruit preserve filling. Varieties include the German Berliner, the Polish pączki, the Israeli sufganiyot, the Southern European krafne and the Italian bombolone. The first record of a jelly doughnut appeared in a German cookbook published in 1485. It is uncertain whether or not that was the precise date of the jelly doughnut's invention. Known then as Gefüllte Krapfen, it spread throughout Europe over the next century, sometimes with other fillings considering sugar and jelly was sparsely found at the time, but Caribbean sugar plantations made both more widely available.

Source: Wikipedia