firstly, in a small blender take handful mint leaves, 1 inch ginger, 1 tsp cumin, 1 tsp chaat masala, 2 tbsp sugar.
add 3 tbsp lemon juice, ¼ tsp salt and blend to smooth paste.
take a tbsp of prepared mint masala paste into large glass.
also add few ice cubes, few mint leaves and 2 slice lemon.
pour in 1 glass of chilled soda and mix well.
finally, garnish with a lemon slice and serve limbu masala soda immediately.