½ oz Old Tom gin1 oz dry gin1½ oz navy strength gin½ oz St-Germain¾ oz lime juice¾ oz red grapefruit juice½ oz grenadine syrup½ oz ginger syrup1 dash Angostura bitters1 dash pimento dram
instructions :

Combine all ingredients in a mixing tin and shake with four ice cubes.
Strain into a tiki mug.
Top with crushed ice.
Garnish with a half grapefruit wheel, a large piece of ginger, 2 pineapple fronds and a Union Jack parasol.

source :
Brian Miller, The Polynesian (New York)