Peel the potatoes, wash, cut into pieces and boil until tender, about 20 minutes. Drain the water.
Peel and wash onions and mushrooms. Cut the onion into cubes, and the mushrooms into slices or slices.
Preheat a frying pan, pour 6 tablespoon. tablespoons of vegetable oil. Fry the onion over medium heat until golden brown, stirring occasionally. About 5 minutes.
Add mushrooms to onions, simmer, stirring occasionally for 10 minutes.
Squeeze sour cabbage from the brine, if there is a need to wash. Add to the pan and simmer the sauerkraut with mushrooms, stirring for 15-20 minutes.
Add boiled potatoes. Season with salt and pepper. Mix everything. Simmer for 4 minutes together.