In this recipe, the sauce is the thing. It is a wonderful tomato sauce, sweetened with sweet basil but given a slight sour tang by the addition of yogurt, sour cream and vinegar. Azeri’s use the sauce on vegetables – particularly green ones – and also on fowl and lamb. A great Azeri recipe from The Silk Road Gourmet Volume One. Azerbaijan is the largest country in the Caucasus region located at the crossroads of Western Asia and Eastern Europe. It is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west and Iran to the south.