I came across cast iron conditioner online. It seems that it's made by a couple of manufacturers, but the most common one is from Camp Chef: http://www.amazon.com/Camp-Chef-CSC-8... The descriptions all state that it's made from "natural", plant-based ingredients, but those ingredients aren't specified. I found one person on another forum who guessed that it might be coconut oil, since that is not supposed to go rancid over time. Anybody know for sure what's in the stuff, or if it is actually useful/worth it?