Add the yeast and the sugar to the warm milk, mix well and let stand for a few minutes. Knead all ingredients except cheese and baking soda to a smooth dough and cover in a warm place for approx. 30 minutes. When the dough has doubled, form 8-10 balls of roughly the same size.
Boil 1l of water with the baking soda, then dip each of the dough pieces in it for about 30 seconds with a skimmer, then place on a greased baking sheet and cut crosswise. Cover again and let rise for 20 minutes, then sprinkle generously with the grated cheese and bake at 190 degrees for 20-25 minutes.
This soda-water mixture is not a `real` lye, but you achieve almost the same optical effect. In addition, the whole thing is absolutely harmless to the hands and still tastes very tasty. A variant that is also suitable for baking with children.