Dissolve the yeast in warm water, add to flour and knead until very smooth to form dough. Cover with damp cloth, let rise about 2-3 hours.
When the dough has risen, make a well in the center, add salty water and the baking powder, knead again. Remove to a lightly floured board, knead a few minutes and roll until very thin about 2 feet square. Spread with fat an