Fill a rocks glass to the top with crushed ice
Place a rosemary sprig into a shaker and muddle
Pour in 40 oz of grapefruit juice, 5 oz of honey syrup, 20 oz of mango syrup and 50 oz of vodka
Add 1 dash of Angostura bitters
Fill the shaker with ice cubes and shake
Strain into the rocks glass
Top up with tonic and stir gently
Top up with crushed ice
Garnish with a peeled grapefruit wedge and a sprig of rosemary