Grate the potatoes and onion using the largest holes of a box grater.

In a bowl, mix the grated potatoes and onion.

Add flour, salt, and pepper to the potato and onion mixture and combine well.

Heat 2 tablespoons of vegetable oil in a large skillet or on an electric griddle set to high.

Once the oil is hot, place half of the potato pancake batter onto the hot pan.

Flatten the batter with a spatula to form a large pancake.

Cook undisturbed until the edges and the bottom of the pancake turn deep brown and crisp.

Gently flip the pancake using a wide spatula.

Cook the other side until nice and crisp.

Slide the pancake onto a plate.

Serve immediately with sour cream or applesauce.