Grate the peeled potatoes on a coarse grater, place them in a bowl, then squeeze out the juice.
Finely chop the onion. Add it to the grated potatoes along with the eggs, flour, salt and pepper. Mix until smooth.
Heat a frying pan, pour in vegetable oil, then put the potato pancakes in with a tablespoon. Fry until golden brown, about 3 minutes on each side.
Place the finished potato pancakes on a plate and serve with sour cream. Enjoy!