Stir the yeast into a alrge mixing bowl with the water & let proof for 10 minutes. Stir in the olive oil, rosemary, sage, olives & garlic. Using a wooden spoon, mix in the flours & salt & stir until the dough is thick & smooth. Knead by hand for 8 to 10 minutes until the dough is firm & elastic. Set the dough in a lightly oiled container, cover with plastic wrap & let rise until doubled. Turn the dough onto an oiled 27 cm X 39 cm baking pan & stretch it to fit. If it won't fit, let it rest for 10 minutes & try again. Cover with a towel & leave until it has half risen, about 30 minutes. 30 minutes before baking, preheat oven to 200ºC . Just before baking, dimple the top of the dough with your fingertips & sprinkle with some extra salt & 2 ts of oil. Bake for 25 to 30 minutes until golden. Slide off baking sheet onto a rack & let cool for a few minutes before eating warm or at room temperature. VARIATION: Focaccia Dolce. Substitute 2 oz raisins & 1 oz pine nuts for the olives, herbs & garlic. Soak the raisins in warm water for 30 minutes before using & toast the pine nuts.