this is a "TOSCANA" recipe!!
You must use the tuscan bread: without salt and crunchy on the outside!
the bread must be "old". this recipe was of poor farmers!
You can try this:
175 gr flour 0
100 gr water
1 gr brewer's yeast
dissolve the yeast in water and add it in flour. then knead the lot. when the mixture is uniform brush with oil, put in container (ex. honey can, 1l). leave to rise for 12/13 hours (ambient temperature).
250gr flour 0
add the first mixture with this ingredients (rapidly), cover and leave it to stand 30/35 min., before cooking. Give a shape. Dust with rice flour and 0, mixed.
put it on a floured baking pan, cover and wait (1,5 hours). It will get bigger.
200° for 15minutes
180° for 30minutes
take out, put on grill and insert-it in the oven (off), again. After 15 minutes, it should be ready!!