2 oz of Dark rum
1 oz of coconut rum
1 splash of Guinness stout (or dark beer)
6-8 oz of Coca-Cola (or coke)
Put a couple of ice cubes into the glass. Pour both rums over the ice and top up with cola. Stir gently and then add a generous splash of smooth draft Guiness to the top. Let the Guinness settle and then enjoy!