While the filling is cooling, knead the dough.
In warm water with 1 tsp sugar and 1 tbsp flour from the total norm, dilute the yeast. After 10 minutes, add the yolk, lightly whipped protein, salt, vegetable oil, mix and add flour. The dough should turn out soft, but not sticky, put it in a bowl greased with oil, cover with a film, let the dough come up in a warm place for 30-40 minutes.