In that recipe you linked to, she says she grates her soap with a food processor. I'm not sure about the hardness of he Fels Naptha, though. This CO soap is hardhardhard. Ah well, now I don't have a food processor. The salad shooter looks like a possibility...and probably cheaper than another food processor. Now that I destroyed his big food processor, I'm a little leery of buying another thing to destroy...