Drain potatoes, and peel while still hot, holding them with a clean kitchen towel. Pass potatoes through a potato ricer or a food mill fitted with the finest disk onto a lightly floured work surface. Make a well in the center of the mound of potatoes, and sprinkle flour evenly over the potatoes. Break egg into the well, and add 1/2 teaspoons salt and the pepper. Using a fork, lightly beat eggs, and incorporate the remaining ingredients to form a dough. Knead lightly on the work surface until the dough is soft and smooth.