I have read about the freshly ground coffee in the rubs but I have never done it. What does adding this do to the rub? How fine do you grind the coffee? Is it regular grind like a Folgers or do you really make it fine like an espresso?
I would imagine that if you put too much in there that the rub will end up being bitter.
I myself prefer the sweeter style rubs and am not sure I would like it.
And please don't tell me that it tastes like coffee (haha!)