
Cacao & coffee spiced rum is a flavored rum — a rum base with cacao and coffee added, usually lightly sweetened.
Coffee-infused rum (e.g., Ron Colón)
Works in the same amount. A dash of chocolate bitters adds back the cacao.
Kraken Black Spiced rum
Has cinnamon and clove instead of coffee. It is slightly sweeter, but the difference is unnoticeable.
Unflavored dark rum
The drink tastes of rum alone. A dash of chocolate bitters and a barspoon of coffee liqueur put some of the flavor back.
Coffee liqueur or crème de cacao
One for one, the drink loses roughly half its strength and turns very sweet. Use 10 ml of liqueur with 30 ml of dark rum for each 40 ml.