Place organic cane sugar in a large mixing bowl.
Add hot, freshly brewed, strong coffee to the bowl with the sugar. Whisk or stir until the sugar is completely dissolved, then allow the mixture to cool.
Stir in rum and sliced vanilla bean. (If you are using vanilla extract instead, you’ll add this in the next step). Transfer the mixture to a jar or other lidded container, or simply use plastic wrap to cover the bowl. Seal tightly and allow the mixture to sit for 2 to 3 weeks in a cool, dry place.
Strain the kahlua mixture to remove the vanilla beans and pieces. (If you opted to use vanilla extract instead of the vanilla bean, now is the time to stir it in! It won't have quite the depth of flavor but it is good.) Transfer your homemade kahlua into a bottle that is easy to pour from and store. Pour over ice to enjoy!
