Half of the yogurt mix with the salt and half - with vinegar. Pour in the recess made in the sifted flour into a deep pot, where a complex sugar and beaten egg. Knead into a soft dough, which is out on floured board and knead 5-6 minutes. Put it in a pot, whose bottom is coated thoroughly with half of the butter. After the pita is baked, still in the pan is coated with the rest butter.