Sauté the onion in oil, add minced meat, salt, and pepper. Sauté together and let cool.
Meanwhile, prepare the dough from curd cheese, semolina, eggs, and salt. Form it into a roll and cut into equal portions. Flatten each portion and fill with the filling. Wrap and shape into dumplings. Cook in boiling water for about 10 minutes, until the dumplings float to the surface. Then, sauté the onion in oil, add sauerkraut, pour in some water, and simmer until tender. Before finishing, season with salt and sugar to taste. Serve with the cooked dumplings.