This drink is called “doogh” in Farsi and “ayran” in Turkish.
1 cup whole-milk yogurt
1 tsp chopped fresh mint or a dash of dried mint flakes, crushed
1/2 tsp salt
1/4 tsp freshly ground black pepper
1 1/2 cups club soda or spring water, chilled
1. Pour yogurt, mint, salt, and pepper into a pitcher. Stir well.
2. Add club soda or spring water gradually, stirring constantly. Add 3 or 4 ice cubes and mix again.
3. Serve chilled.