Bialys back in their turn-of-the-century heyday in Bialystok, Poland were very large, very flat affairs covered from one side to the other with chopped onion. After a few decades in New York bialys became both smaller and chubbier, with naught but a sprinkling of onion in the center. This is my attempt to split the difference to some degree. These sport the thicker torus shape but contain more onion because, well, I think more flavor per bite is better.
I confess the idea of using a starter for these was tempting. I found a few notes here and there on some recipe boards to the effect that a starter would be “traditional” for bialys. I’m inclined to dispute that. Bialys were invented in Bialystok, Poland around the year 1880. Which means they are by any definition a “modern”, “city” bread, made with the packaged brewer’s yeast that would have been commonly available at the time. Considering how much the Poles have always loved light, fluffy, fast-rising breads I think the odds of bialys being sponge-raised are remote. Still I’m not stickler for authenticity. Some of dough or starter would work well here. Substitute either for up to 1/3 of the dough, making sure the 50% hydration ratio is retained, and making sure you use high gluten or bread flour for either preferment.
2 cups (10 ounces) high-gluten or bread flour
1/2 teaspoon instant yeast
1 teaspoon salt
5 ounces (2/3 cup minus a teaspoon) water at room temperature
1/2 recipe caramelized onions, chopped