3/4 oz. black blended overproof rum
2 oz. fresh lime juice
1 tsp. fresh lemon juice
1 1/2 oz. passion fruit syrup
1/4 oz. demerara syrup
1/4 oz. Luxardo Maraschino liqueur
1 1/2 oz. blended aged rum
Garnish: None
Pour the overproof rum into a separate old-fashioned or shot glass and set aside. Add the remaining ingredients to a drink mixer tin. Fill with 12 ounces of crushed ice and 4 to 6 small "agitator" cubes. Flash blend and open pour with gated finish into a double old-fashioned glass, and serve with the side of overproof rum (the side of danger!). Encourage guests to pour as much or as little of the overproof rum into their drink as they like, and experience how the drink flaver changes.