1) If you’re using cumin seeds, gently toast them in a pan over medium-high heat until they deepen in colour slightly and give off their nutty aroma. Remove from heat, cool for a minute, then grind to a fine powder in a spice grinder.
2) Pour lime juice and water into a blender. Drop in mint leaves (smack them first between your palms to release their aromatic oils), sugar, ground cumin, chaat masala, kosher salt and black pepper. Blend on high until it’s as smooth as possible.
3) Strain into a pitcher. (Don’t throw the solids away! You can stir them into some softened butter, and spoon it over warm roasted vegetables or just lather up a piece of toast!)
4) Add some ice, then pour in club soda. Stir. Garnish with fresh mint leaves and slices of lime.
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