Do you shredded potato flour (may be a child's meal, There also try next time, I missed buying it), pay by installments. Add half the egg. How can halve? Beat out egg, whisk and pour half into potato flour. Osolíme, half a teaspoon would be enough, add half a teaspoon of potato starch and mix well. Flour can be added gradually, if you have a concern, the batter will be thin, ale 220 g flour on 500 g potatoes should not be allowed. Create two rollers dumplings, thus diameter 5 centimetrů. Nicely rolled out on floured cutting board, the dough will not stick. So, the cove, ready, water boils, so do it carefully insert the dumplings and cook about 20 minutes. You dumplings, that fell to the bottom of the pot and there adhere, nudge stirring spoons, float.