Lassi is yogurt-based drink served at all of the Indian restaurants I've patronized. The original recipe is from Yamuna Devi's incredible cookbook, The Art of Indian Vegetarian Cooking .
When I first made this recipe (years ago) I used extra-fine refined white sugar (and it was delicious!) but I can't get ultra-fine organic or biodynamic sugar so I use a smaller amount of honey.
Sweet Lassi Yogurt Drink
Makes 4 cups
3 cups yogurt
1/3 - 2/3 cups sweetener (I use 1/3 cups honey)
1/2 cup water
1 cup ice cubes or frozen fruit like mango* (photo above is a mango lassi)
1/4 t. cardamom powder (optional)
Blitz everything in a blender until smooth and frothy. If your blender can't handle ice you will need to crush it first.
Restaurants serve this over ice but I prefer it 'neat'.
*I have found that prepared frozen mango is not that tasty because it's made with Alfonso mangoes, which are large but bland. I prefer to freeze champagne mangoes (the small almost flat ones occasionally available at Whole Foods) which have much more flavor.