Prepare the Chickpea Powder: Add the skinless roasted chickpeas to a mixer jar and blend them into a fine, smooth powder. You can sift it through a strainer for an ultra-smooth texture. Set this aside.
Make the Green Paste: In the same mixer jar, add the fresh mint leaves, coriander leaves, green chilli, and the piece of raw mango. Add a splash of water and blend it into a fine green paste.
Prepare the Base: Take a large mixing bowl or pitcher and pour in two glasses of cold water.
Mix the Flavours: Add two teaspoons of the prepared green paste into the cold water (use about 1 teaspoon per glass).
Season the Drink: To the bowl, add the rock sugar powder, roasted cumin powder, black salt, regular salt, and fresh lemon juice. Stir well to combine.
Add the Chickpea Powder: Now, add two tablespoons of the roasted chickpea powder to the flavoured water.
Whisk Well: Mix vigorously to ensure there are no lumps and the powder blends smoothly into your Sattu Sarbat.
Serve and Enjoy: Pour the Roasted Chickpea Drink into serving glasses. Stir well right before drinking, as the heavy powder tends to settle at the bottom. Add ice cubes or a spoonful of soaked sabja seeds to make it extra cooling!