1 oz Door County Distillery Golden Rum
1 oz Door County Distillery Rock Island Rum
2 oz orange juice
2 oz pineapple juice
Splash of lime juice
1 oz soda water
Sanding sugar and black food coloring for rim (optional)
Take sanding sugar and use food coloring to dye black. Wet rim of glass with water or lime juice. Dip rim of glass in dyed sanding sugar.
Place blackberries in the bottom of prepared glass and muddle. Add ice. Set aside.
Add rums, orange juice, pineapple juice, lime juice, and soda water to a shaker filled with ice. Shake until very cold. Strain into prepared glass.