.75 oz Lime Juice
.5 oz Grapefruit Juice
.5 Simple Syrup
.25 oz Allspice Dram
1 oz Demerara Rum
1 oz Dark Jamaican Rum
Shake well with 1 cup of crushed ice and pour unstrained into a double old fashioned glass.
Garnish: Mint sprig and scored lime wedge