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A bagel is a bread roll originating in the Jewish communities of Poland. Bagels are traditionally made from yeasted wheat dough that is shaped by hand into a torus or ring, briefly boiled in water, and then baked. The result is a dense, chewy, doughy interior with a browned and sometimes crisp exterior. Bagels are often topped with seeds baked on the outer crust—traditional choices include poppy and sesame seeds—or with salt grains. Different dough types include whole-grain and rye. The basic roll-with-a-hole design, hundreds of years old, allows even cooking and baking of the dough; it also allows groups of bagels to be gathered on a string or dowel for handling, transportation, and retail display.

Source: Wikipedia