Recently I bartended a company holiday party where they were having a fun competition to see who could come up with the best mixed drink. I submitted my first mostly original drink, the Barbados Slim.
Named after the character from Futurama, it's a standard rum and coke (though black rums work best) with creme de cacao and grenadine to give it a chocolate-covered cherry taste.
1 oz Kraken Rum
1/2 oz Creme de Cacao
1/2 oz Grenadine
Fill with Coke and garnish with a cherry
Stir gently before serving
Depending on how big the glass is and how much coke you're using, you may want to adjust the cacao and grenadine amounts to ensure you get both chocolate and cherry flavors. Stirring is important, as the creme de cacao in particular is denser than the coke and rum and will collect all at the bottom.