In a medium sized bowl, mix dates and coffee together and let sit for about an hour.
Add mixture to the bowl of a food processor and pulse for 30 seconds (until dates break up a bit); add tahini and cocoa powder and blend until mixture becomes creamy (turn off the machine and scrape the sides down a couple of times to make sure you get all the bits).
Scrape mixture into a large mason jar and keep in the fridge for up to a month.