In a bowl, combine all the ingredients and mix thoroughly using a fork.
Break up any clumps, especially those of ground coffee and dark brown sugar, if necessary.
Use this rub immediately, or store it in an airtight container away from direct sunlight for future use.
Apply this rub evenly on the meat at least one hour before cooking for the best results.
This rub can last up to a month, but I usually use it up before then!
