Warm up your non-dairy milk in a small saucepan (don’t let it boil, just get it pretty warm). Chop up your dark chocolate bar into small shreds and add the chocolate to your warm milk.
Allow the warm milk to melt the chocolate and whisk to combine until it’s all blended through. Give your mixture a taste to see if you want it to have more chocolate and add and melt more chopped chocolate if you do.
Add the condensed coconut milk to you warm mixture, stir until dissolved, and taste to adjust the level as needed. Last but not least, add your dark rum to taste!