To make the thandai powder, add all ingredients to a spice grinder.
Grind until you get a smooth powder. Store in an airtight container and use as needed.
To Make Thandai
Heat 1 cup (240 ml) of milk in a saucepan on medium heat. Once it's warm, add 1 tablespoon thandai powder to it along with 1-2 teaspoons of sugar (as per taste).
Stir until everything is well combined. Serve warm or cold.
Notes
This recipes make around 165 grams (1 3/4 cups) of thandai powder. Store in an airtight container, it will last for month!
The nutritional value given here is for 1 cup. 1 tablespoon of this powder has around 30 calories.