Muddle the base: In a tall glass, muddle the mint leaves, raspberries, lime wedges, and sugar together until the juices release and the sugar dissolves. Add the rum: Pour in the white rum and stir to mix. Fill with ice: Add plenty of crushed ice to the glass. Top with fizz: Fill the rest of the glass with soda water, stirring gently to combine. Garnish & serve: Garnish with extra raspberries, a lime wedge, and a sprig of mint. Serve with a straw.
