In the bowl of a stand mixer, stir 1 teaspoon active dry yeast and ¾ cup warm water with a pinch Pinch of sugar. Let stand for 5 minutes or until foamy.
Add ½ tablespoon olive oil and 1 cup superfine whole wheat flour. Beat with a wooden spoon until blended, then attach to the mixer with the dough hook.
Gradually add ¾ teaspoons salt and 1 ½ cups bread or all-purpose flour, ½ cup at a time, while mixing at medium-low speed.
Knead for about 5 minutes and check to see if it needs more flour. It should be elastic and just a bit sticky.
If it's pooling too much in the bottom of the pan or too wet, add more bread flour, by tablespoons, until you have a velvety dough that doesn't stick but is not stiff. I prefer to err on the wet side since focaccia doesn't have to be formed into any shape, and a too-stiff dough will mean a tougher bread.
Coat a clean bowl with olive oil, transfer dough, turn to coat in the oil, cover and let rise until doubled at room temperature, about 1 to 1 ¼ hours.
Oil two 9x13x2 inch baking pans. Preheat oven to 400ºF (200°C).
Transfer dough to a barely floured board.
Gather it and place it inside the pan. With oiled hands, press toward the borders until you fill the whole pan. If the dough resists, wait a few minutes and then stretch again with your fingers.
Liberally sprinkle the dough with about ¼ cup olive oil, scatter 2 tablespoons fresh rosemary on top and sprinkle Sea salt and ground black pepper to taste.
Let it rise, loosely covered with plastic wrap, until almost doubled, 35 to 45 minutes.
Dimple the dough with your fingers, making indentations, and bake for about 20 minutes until golden and the top is dry and crusty. When tapped on the bottom, it should sound hollow.
Let cool on a wire rack for 5 minutes, remove from the pan and transfer to a wooden surface.
Cut into squares and serve. You can drizzle it lightly with olive oil and sprinkle with black pepper to taste.