Mix milk, egg and salt in a sauteuse, with addition of flour, so as to make dough like for pancakes, and stir well. The dough should be free of lumps. Start medium heating and, stirring constantly, warm the mixture to a thick state. Remove the bowl with the dough from fire and add flour. It is important that the dough is elastic and not sticky. Roll the dough into a film and leave to rest for 30 minutes. Prepare the filling (for example, mix cottage cheese with sugar). Then mold crescent-shaped vareniki. Cook and serve with sour cream, honey and berries.