Ingredients:
- 5 cups unbleached all-purpose flour
- ¼ teaspoon active dry yeast
- 2 teaspoons fine sea salt
- 1 ½ cups plus 1 tablespoon cool water (about 65°F)
- Coarse whole-wheat flour (e.g., graham flour) or rye flour, for dusting
- Onion Topping (see recipe below)
- 6 teaspoons bread crumbs
- ¾ teaspoon flake sea salt, plus more for finishing