1 lemon, juiced
1 tbsp golden caster sugar
Small handful of mint, leaves picked
100ml white rum
300ml soda water
Place the lemon juice, golden caster sugar, and half of the mint leaves into a cocktail shaker. Use a cocktail muddler or the end of a rolling pin to try and dissolve the sugar.
Add the white rum and limoncello to the shaker along with a handful of ice. Cover the shaker and shake until the outside feels cold.
Fill two tall glasses with ice, then strain the cocktail into the glasses and top with soda water. To serve, garnish the glasses with the leftover mint leaves.