I realize I’m answering an older question, but who knows, somebody may still be looking for piadina. Copied from a book at the library a few years back. I first had them in Cremona, years ago where they were wrapped around porchetta, some greens and a garlicky mayo. Also good with soft chesses, procuitto or whatever…
3.5 cups AP flour
0.5 teaspoons baking flour
1-teaspoon salt
1-cup warm water
0.25 cups olive oil
1. Combine dry ingredients
2. Add water and oil
3. Mix ‘till smooth
4. Knead by hand for a minute or so
5. Rest covered for 20 minutes to an hour
6. Cut into eight pieces and shape into balls
7. Roll into eight inch circles, stack between pieces of waxed paper
Heat a griddle (I use a cast iron skillet) ‘till hot (jumping water). No oil. Cook 1 minute or so each side ‘till golden brown and stiffened a bit. Cover and keep warm while you do the rest of them. I often just make half a batch.