Lahaina Sailor’s Grog

1 ½ oz Old Lahaina Silver Rum
1 ½ oz Old Lahaina Dark Rum
½ oz lime juice
¾ oz grapefruit juice
¾ oz honey syrup
Club soda

Combine rums, juices and honey syrup in a large cocktail glass. Add ice and top with club soda. Stir gently and garnish with a grapefruit twist.