Traditional Polish Pierogi with Cheese and Egg Filling

Method

1. In a large bowl, mix flour and salt.
2. Make a well in the center and add milk, egg, and 1/4 cup water. Mix until a dough forms.
3. Knead the dough for 5 minutes, then let it rest for 30 minutes.
4. Roll out the dough and cut into 3-inch circles.
5. Fill each with a mixture of Parmesan, farmer's cheese, and egg.
6. Boil the dumplings in salted water until they float.
7. Serve with a dollop of sour cream and melted butter.