In a saucepan with warm water (35-40 degrees), dilute dry yeast, salt and sugar. Add 2 tbsp. l. vegetable oil, and gradually add flour, kneading thoroughly. Then moisten the table with vegetable oil and knead the dough with your hands for 10-15 minutes. Let the dough rise for 1-1.5 hours.
Cut potatoes, onions and mushrooms into small cubes. Add salt, ground black pepper and lean mayonnaise.
When the dough has risen, divide it into balls. We roll each ball with our hands into cakes. Put the filling on top. Roll the dough around. Bake at 200°C for 25 minutes.