Leave it warm to rise. Sift flour and salt it. Mix the rising yeast, warm milk with oil. Knead until the dough is smooth and elastic. Let the dough rise in a warm location. When the dough is doubled in size, roll the dough on a floured board, spread whipped egg whites on the roll dough and sprinkle with the filling. Roll and place in a greased baking pan. Bake for 45 minutes at 160 to 170 ° C.