Zombie

• 1 oz. light rum
• 1 oz. gold rum
• 1 oz. dark rum
• 1 oz. lime juice
• ½ oz. pineapple juice
• ½ oz. grapefruit juice
• ½ oz. grenadine syrup
• 1 sprig fresh mint

Mix all the ingredients except the mint into a pitcher and stir well to combine.
Into a glass add crushed ice and pour over the cocktail. 
Serve garnished with fresh mint.