Dissolve the crumbled yeast, salt and olive oil in warm water and mix well. Make a well in the flour, add chopped olives, rosemary and sage. Gradually add the mixture of water, oil, yeast and salt and knead well.
Cover and let the dough rise for at least 1 hour. Then knead again and as flat cakes on a baking sheet. Spread the cherry tomatoes on top and press in firmly. Let rise for another 20 minutes.
Sprinkle with fleur de sel and bake in the preheated oven at 200 ° C for about 25 minutes.