A friend was telling me about a trip to Mexcio and mentioned that she would have cafe de olla coffee every morning. It sounded like a wonderful combination of sugar and spice. It also sounded like it would be a great dessert (or breakfast now that summer is here). And chocolate is something you should throw into everything. —Yellow Dog
Combine first 4 ingredients in a saucepan over medium heat. Heat until sugar dissolves. Take off heat and let coffee beans and cinnamon steep for 1 hour.
Pour mixture through a fine mesh strainer. Rinse off the beans and cinnamon and throw into the composter. Cool liquid in the fridge for a couple of hours.
Add vanilla to liquid and make ice cream! Freeze in ice cream maker according to manufacturer's instructions.
During the last two minutes of freezing add white rum (this helps prevent the ice cream from getting too hard, if you are one of those people that can have a quart of ice cream sitting in the fridge for more than a day) and chocolate chunks.
This is the hard part. Transfer the ice cream to a container, put in the freezer and resist the urge to eat it all for 4-6 hours.