Afghan murgh kebab (chicken kebab) and white sauce is a classic combination — the tangy, earthy sauce complements the turmeric-stained grilled chicken. Here, the two inspire a creamy, lemony chicken salad. Traditionally, Afghan white sauce is made with mayonnaise, milk, dried dill, vinegar and often MSG. A bit of Greek yogurt balances the richness of the mayo while maintaining a texture sturdy enough for a pita pocket. Fresh dill, sugar, salt and vinegar pay homage to the original…