Bialy, a Yiddish word short for bialystoker kuchen, from Białystok, a city in Poland, is a small roll that is a traditional dish in Polish Ashkenazi cuisine. A traditional bialy has a diameter of up to 15 cm (6 inches) and is a chewy yeast roll similar to a bagel. Unlike a bagel, which is boiled before baking, a bialy is simply baked, and instead of a hole in the middle it has a depression. Before baking, this depression is filled with diced onions and other ingredients, including (depending on the recipe) garlic, poppy seeds, or bread crumbs.
In 2002, former New York Times food writer Mimi Sheraton wrote a book dedicated to the bialy, called The Bialy Eaters: The Story of a Bread and a Lost World.