To make buttermilk, start by pouring 1 cup of plain yogurt into a blender. Add 1 cup of cold water and a pinch of salt. Blend the mixture until it becomes smooth and frothy. You can also add some fresh herbs like mint or coriander for extra flavor. Once blended, pour the buttermilk into a glass and serve chilled. Buttermilk is a refreshing drink that is perfect for a hot summer day or as a healthy accompaniment to any meal. Enjoy the tangy and creamy goodness of homemade buttermilk!