1/2 cup allspice berries
2 1/2 cups navy-strength rum (see Cook's Note)
200 grams granulated sugar
Any overproof rum will work here, meaning any rum over 50 percent ABV. But navy-strength rum, typically bottled at 57 percent ABV, is my favorite. Just remember: The higher the ABV of the rum, the higher the ABV of your resulting dram.