Place the flour on a cutting board. With your fist, make a well in the center of the flour. On the edge of the volcano, sparkle salt and baking soda.
In the center, pour the milk, olive oil, and half the hot water. Then, start bringing the flour toward the center and kneading, flowing in all the water as you go.
Knead the dough for a long time, even 10-12 minutes, until it is soft and elastic.
Cut out 6 or 8 balls of dough. Roll out the piadina with a rolling pin one at a time. Place the small rolling pin in the center of the ball and start spreading it out. Then, roll the piadina by pushing the rolling pin from the center outward.
Cook one piadina at a time on the hot aluminum pan for 3-4 minutes per side. When the pan is hot, you may need less time.
Keep the cooked piadina sealed in a clean dish towel to keep them warm while you cook the others; serve immediately.