Mix everything and blend in a good quality blender.
Taste and add seasonings as needed.
Sweet Lassi: Sub 2 teaspoons or more sugar/sweetener for salt. You could also use honey, agave nectar, or your sweetener of choice.
Mango Lassi: Add I cup ripe mango cubes and 1/4 teaspoons cardamom. You could also use a few saffron strands if you're feeling fancy. Sometimes people add a tinge of rose syrup to this but I find it overpowers the mango flavor a bit.