1Grate the onion. Squeeze it very hard and throw out all the juice, otherwise the patties will fall apart.
2Peel and grate the potatoes, then squeeze out as much liquid as you can.
3Add the onion and potatoes to the ground beef along with the egg, flour and spices. Mix with your hands until well combined. The mixture will be very sticky.
4Heat the oil in a shallow pan over medium heat.
5Keep a bowl of water nearby and wet your hands. Take about 2 tablespoons of the mixture, shape it into an oval and fry for about 5 minutes on each side, until browned and cooked through.
6Serve warm with tomatoes, pickles and fries, or tucked into a sandwich with fresh herbs.