Add mint leaves, ginger, lime juice, sugar, cumin powder, chaat masala, black pepper powder, black salt, and water in the small jar of a blender.
Blend to make a smooth paste.
Pass the mixture through a fine-mesh strainer.
Add 4-5 tablespoon of this mixture into a tall serving glass. Add a few ice cubes.
Top the glass with club soda and stir gently. Garnish with lime slices and mint leaves and serve immediately.
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