Bialys
1 large yellow onion, diced 1 pinch cayenne pepper 1 tablespoon bread crumbs 1 tablespoon olive oil 1 tablespoon sliced green onion 1 ½ cups water, at room temperature 1 ½ teaspoons kosher salt 2 teaspoons poppy seeds, plus more for garnis… 3 ¾ cups bread flour ½ teaspoon instant yeast ½ teaspoon kosher salt, plus more to taste