Scoop out the hot potatoes. Use a cloth to hold the potato.
Push the potato through a sieve into a bowl. Do it a small bit at at time until all the potato has been done.
Sift the flour into the potato.
Separate the egg yolk and add it to the potato.
Grate the cheese and add it to the potato.
Season with salt and pepper.
Mix the potato, flour, egg yolk and cheese until it forms a dough.