Place lime and brown sugar into a cocktail shaker. Muddle gently using the base of wooden spoon or a muddler to release the lime juice and combine with the sugar.
Add the passionfruit pulp, Vodka and crushed ice. Shake, shake, shake!!
Divide mixture between 2 serving glasses. Top each glass with chilled passionfruit softdrink to fill. Garnish with fresh mint leaves and serve.