This buttermilk has mango pulp added.
The buttermilk that you buy in the store is not purely traditional, because it has been pasteurized, and it has been homogenized. People in the West normally considered that to be “real” buttermilk, but in the East, buttermilk is a made up of churning pure butter. That butter is made by churning cream with water. You can also get this butter by churning yogurt with water.