Yogurt diluted with water (Best Option)
3/4 cup plain yogurt + 1/4 cup water per 1 cup buttermilkYogurt contains lactic acid similar to buttermilk, which helps tenderize meat and balance spices in curry. Diluting yogurt with water adjusts the thickness to mimic buttermilk’s consistency, ensuring even integration into the sauce.
For best results, use plain, unsweetened yogurt and stir well with water before adding. Avoid overly thick Greek yogurt unless further diluted, as it can alter the curry's mouthfeel.
This substitute preserves the tangy brightness and creamy texture of buttermilk, keeping the curry flavorful and balanced without introducing off-flavors.