Made from thick, rich sheep’s milk yogurt, this tangy sauce is part of the meze table in every Greek taverna. It can also be found in Turkey, where it is called cacìk. For a similar consistency with cow’s milk yogurt, you must first drain it of excess water. The sauce is delicious served with fried eggplant and zucchini, lamb chops or meatballs, or as a dip for pita bread.