Bring 1 l water to boil, take off the burner and add the baking soda. Place each dough ball into the water and make sure it is covered with water on both sides – let it rest for 30-40 sec and take it out again. Let it dry a bit and put it on a parchment paper. Preheat the oven to 180 degrees. Cut each ball with a scissor into two halfs, so it will get that chestnut look. Sprinkle with salt and bake for 20-25 minutes, you can spray them with water again for a nice coat. Enjoy!