How to cook
Dissolve the baking soda in the yoghurt. Mix in the egg, salt and add flour as needed for kneading a medium hard dough. Roll it out on a floured board and cut out circles with a glass.
Stick together each pair of circles, while putting some crushed boiled eggs in the middle between them. Fry thus prepared pirozhki in hot oil and drain onto a cooking grid, with paper towels underneath.