Combine boiling water, 1 teaspoon rosemary, and honey in a large bowl; cool to 100° to 110°. Sprinkle yeast over honey mixture; let stand 5 minutes. Lightly spoon flour into dry measuring cups; level with a knife. Add 3 1/4 cups flour, 2 tablespoons oil, and 1 teaspoon salt to honey mixture, stirring to form a soft dough. Turn dough out onto a floured surface. Knead until smooth and elastic (about 10 minutes); add enough of remaining flour, 1 tablespoon at a time, to prevent dough from sticking to hands (dough will feel sticky).
Place dough in a large bowl coated with cooking spray, turning to coat top. Cover and let rise in a warm place (85°), free from drafts, 45 minutes or until doubled in size. (Gently press two fingers into dough. If indentation remains, dough has risen enough.) Punch dough down. Pat dough into a 14 x 12-inch rectangle on a baking sheet coated with cooking spray. Cover and let rise 20 minutes or until doubled in size.
Preheat oven to 350º.
Uncover dough. Make indentations in top of dough using handle of a wooden spoon or your fingertips. Combine 1 tablespoon oil, 1 teaspoon water, and egg yolk; brush over dough. Drizzle with remaining 1 tablespoon oil; sprinkle with remaining rosemary and sea salt.
Bake at 350° for 25 minutes or until lightly browned. Remove from pan; cool on a wire rack.