Dissolve the brewer’s yeast in warm water and add it to the flour that you have poured onto a large marble base. Start the dough with your hands adding a little water, until the dough is compact enough, create a loaf at the end of the work, flour and wrap it in a towel and let it rise for about an hour.
At this point, add the baking soda and a few tablespoons of oil and resume kneading until completely absorbed.
Make round and thin leaves of dough with the help of a rolling pin.
Fry the onion cut into thin slices and the peeled and seeded tomato in a pan with a little oil. Arrange the sautéed, adding the caciocavallo, chopped chilli and a pinch of salt, on the pasta leaves and wrap the scacce on themselves like the strudel. Solder the edges and brush with oil. Bake in a very hot oven and leave to cook for about 1/2 hour. Serve hot.