Let the yoghurt drain overnight in a sieve (covered with paper towel). Grind the garlic with salt in a mortar to a smooth paste. Chop the parsley into small pieces. Mix the yogurt with the garlic paste and parsley.
Roast the sesame seeds in a pan without fat until golden brown, turning several times, allow to cool and sprinkle over the sauce. Tastes very good with meatballs or skewers.