In a small skillet, saute onion in 2 tablespoons oil until tender; cool. Combine the rosemary, basil and oregano; set aside.
In a large bowl, dissolve yeast in 1/4 cup warm water. Add sugar; let stand for 5 minutes. Add 2 tablespoons oil, salt, garlic powder, 2 cups flour and remaining water. Beat until smooth. Stir in enough remaining flour to form a soft dough.
Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Add onion and half of the herb mixture; knead 1 minute longer. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 40 minutes.
Punch dough down. Turn onto a lightly floured surface; divide in half. Roll each portion into a 10-in. circle; let rest for 5 minutes. Grease two baking sheets and sprinkle with cornmeal. Transfer dough to prepared pans; reshape if necessary. Cover and let rise until doubled, about 40 minutes.
Brush with remaining oil. Sprinkle with coarse salt and remaining herb mixture. Bake at 375° for 25-30 minutes or until golden brown. Remove from pans to wire racks. Cut into wedges; serve warm.
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