Queen of Herts
Add mint, sugar and lime / lemon juice into a cocktail shaker and muddle together until sugar is dissolved. Add the rum and the grapefruit juice and ice and shake well until your hand is frozen. Strain into a chilled glass and top up with the soda water and add a dash of bitters.
50ml Scratch Golden or Faithful Rum
10ml lime juice or lemon juice
Couple of mint sprigs
1 teaspoon of sugar
150 ml grapefruit juice
Soda water to top up
Dash of Angostura bitters