Preparation Stir together yeast, honey, and 1 cup warm water in a bowl, then let stand until foamy, about 5 minutes. (If mixture doesn't foam, discard and start over with new yeast.) While yeast mixture stands, stir together 2 cups all-purpose flour with barley and semolina flours, nigella seeds, and salt in a large bowl. Make a well in flour mixture (still in bowl) and add yeast mixture, 3 tablespoons oil, and remaining 3/4 cup water, then stir until a soft dough forms. Turn dough out onto a lightly floured surface and knead, working in just enough of remaining 1/3 cup all-purpose flour to keep dough from sticking, until dough is smooth and elastic, 6 to 8 minutes. Put pizza stone on lowest rack of oven and preheat oven to 450°F. Divide dough into 3 equal pieces and form each into a ball. Sprinkle a baking sheet with cornmeal and arrange balls of dough on it. Firmly flatten balls into 5-inch rounds (leave about 2 inches between each), then brush dough with remaining tablespoon oil. Cover rounds loosely with plastic wrap and a kitchen towel, and let stand to rise in a draft-free place at warm room temperature, 1 hour. Transfer loaves, 1 at a time, using floured peel or baking sheet, to pizza stone and bake until well browned and loaves sound hollow when tapped on bottoms, about 20 minutes. Transfer to a rack to cool.
Preparation Stir together yeast, honey, and 1 cup warm water in a bowl, then let stand until foamy, about 5 minutes. (If mixture doesn't foam, discard and start over with new yeast.) While yeast mixture stands, stir together 2 cups all-purpose flour with barley and semolina flours, nigella seeds, and salt in a large bowl. Make a well in flour mixture (still in bowl) and add yeast mixture, 3 tablespoons oil, and remaining 3/4 cup water, then stir until a soft dough forms. Turn dough out onto a lightly floured surface and knead, working in just enough of remaining 1/3 cup all-purpose flour to keep dough from sticking, until dough is smooth and elastic, 6 to 8 minutes. Put pizza stone on lowest rack of oven and preheat oven to 450°F. Divide dough into 3 equal pieces and form each into a ball. Sprinkle a baking sheet with cornmeal and arrange balls of dough on it. Firmly flatten balls into 5-inch rounds (leave about 2 inches between each), then brush dough with remaining tablespoon oil. Cover rounds loosely with plastic wrap and a kitchen towel, and let stand to rise in a draft-free place at warm room temperature, 1 hour. Transfer loaves, 1 at a time, using floured peel or baking sheet, to pizza stone and bake until well browned and loaves sound hollow when tapped on bottoms, about 20 minutes. Transfer to a rack to cool.